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	-%s or -o option
	-ilrsD or -c command or -O shopt_option		(invocation only)

malloc: %s:%d: assertion botched
  (wd: %s) (core dumped) line $%s: cannot assign in this way%c%c: invalid option%d: invalid file descriptor: %s%s can be invoked via %s has null exportstr%s is %s
%s is a function
%s is a shell builtin
%s is a shell keyword
%s is a special shell builtin
%s is aliased to `%s'
%s is hashed (%s)
%s is not bound to any keys.
%s out of range%s%s%s: %s (error token is "%s")%s: %s%s: %s out of range%s: %s: bad interpreter%s: %s: cannot open as FILE%s: %s: compatibility value out of range%s: %s: invalid value for trace file descriptor%s: %s: must use subscript when assigning associative array%s: %s:%d: cannot allocate %lu bytes%s: %s:%d: cannot allocate %lu bytes (%lu bytes allocated)%s: Is a directory%s: ambiguous job spec%s: ambiguous redirect%s: arguments must be process or job IDs%s: bad network path specification%s: bad substitution%s: binary operator expected%s: cannot allocate %lu bytes%s: cannot allocate %lu bytes (%lu bytes allocated)%s: cannot assign fd to variable%s: cannot assign list to array member%s: cannot assign to non-numeric index%s: cannot convert associative to indexed array%s: cannot convert indexed to associative array%s: cannot create: %s%s: cannot delete: %s%s: cannot destroy array variables in this way%s: cannot execute binary file%s: cannot execute binary file: %s%s: cannot execute: %s%s: cannot export%s: cannot get limit: %s%s: cannot modify limit: %s%s: cannot open temp file: %s%s: cannot open: %s%s: cannot overwrite existing file%s: cannot read: %s%s: cannot unset%s: cannot unset: readonly %s%s: circular name reference%s: command not found%s: error retrieving current directory: %s: %s
%s: expression error
%s: file is too large%s: file not found%s: first non-whitespace character is not `"'%s: hash table empty
%s: history expansion failed%s: host unknown%s: illegal option -- %c
%s: inlib failed%s: integer expression expected%s: invalid action name%s: invalid argument%s: invalid array origin%s: invalid associative array key%s: invalid callback quantum%s: invalid file descriptor specification%s: invalid indirect expansion%s: invalid limit argument%s: invalid line count%s: invalid option%s: invalid option name%s: invalid service%s: invalid shell option name%s: invalid signal specification%s: invalid timeout specification%s: invalid variable name%s: invalid variable name for name reference%s: is a directory%s: job %d already in background%s: job has terminated%s: line %d: %s: maximum function nesting level exceeded (%d)%s: maximum source nesting level exceeded (%d)%s: missing colon separator%s: nameref variable self references not allowed%s: no completion specification%s: no job control%s: no such job%s: not a function%s: not a regular file%s: not a shell builtin%s: not an array variable%s: not an indexed array%s: not dynamically loaded%s: not found%s: numeric argument required%s: option requires an argument%s: option requires an argument -- %c
%s: parameter null or not set%s: quoted compound array assignment deprecated%s: readonly function%s: readonly variable%s: reference variable cannot be an array%s: restricted%s: restricted: cannot redirect output%s: restricted: cannot specify `/' in command names%s: substring expression < 0%s: unary operator expected%s: unbound variable%s: usage: %s: variable may not be assigned value(( expression ))(core dumped) (wd now: %s)
. filename [arguments]/dev/(tcp|udp)/host/port not supported without networking/tmp must be a valid directory name<no current directory>ABORT instructionAborting...Add directories to stack.
    
    Adds a directory to the top of the directory stack, or rotates
    the stack, making the new top of the stack the current working
    directory.  With no arguments, exchanges the top two directories.
    
    Options:
      -n	Suppresses the normal change of directory when adding
    		directories to the stack, so only the stack is manipulated.
    
    Arguments:
      +N	Rotates the stack so that the Nth directory (counting
    		from the left of the list shown by `dirs', starting with
    		zero) is at the top.
    
      -N	Rotates the stack so that the Nth directory (counting
    		from the right of the list shown by `dirs', starting with
    		zero) is at the top.
    
      dir	Adds DIR to the directory stack at the top, making it the
    		new current working directory.
    
    The `dirs' builtin displays the directory stack.
    
    Exit Status:
    Returns success unless an invalid argument is supplied or the directory
    change fails.Adds a directory to the top of the directory stack, or rotates
    the stack, making the new top of the stack the current working
    directory.  With no arguments, exchanges the top two directories.
    
    Options:
      -n	Suppresses the normal change of directory when adding
    	directories to the stack, so only the stack is manipulated.
    
    Arguments:
      +N	Rotates the stack so that the Nth directory (counting
    	from the left of the list shown by `dirs', starting with
    	zero) is at the top.
    
      -N	Rotates the stack so that the Nth directory (counting
    	from the right of the list shown by `dirs', starting with
    	zero) is at the top.
    
      dir	Adds DIR to the directory stack at the top, making it the
    	new current working directory.
    
    The `dirs' builtin displays the directory stack.Alarm (profile)Alarm (virtual)Alarm clockArithmetic for loop.
    
    Equivalent to
    	(( EXP1 ))
    	while (( EXP2 )); do
    		COMMANDS
    		(( EXP3 ))
    	done
    EXP1, EXP2, and EXP3 are arithmetic expressions.  If any expression is
    omitted, it behaves as if it evaluates to 1.
    
    Exit Status:
    Returns the status of the last command executed.BPT trace/trapBad system callBogus signalBroken pipeBus errorCPU limitChange the shell working directory.
    
    Change the current directory to DIR.  The default DIR is the value of the
    HOME shell variable.
    
    The variable CDPATH defines the search path for the directory containing
    DIR.  Alternative directory names in CDPATH are separated by a colon (:).
    A null directory name is the same as the current directory.  If DIR begins
    with a slash (/), then CDPATH is not used.
    
    If the directory is not found, and the shell option `cdable_vars' is set,
    the word is assumed to be  a variable name.  If that variable has a value,
    its value is used for DIR.
    
    Options:
      -L	force symbolic links to be followed: resolve symbolic
    		links in DIR after processing instances of `..'
      -P	use the physical directory structure without following
    		symbolic links: resolve symbolic links in DIR before
    		processing instances of `..'
      -e	if the -P option is supplied, and the current working
    		directory cannot be determined successfully, exit with
    		a non-zero status
      -@	on systems that support it, present a file with extended
    		attributes as a directory containing the file attributes
    
    The default is to follow symbolic links, as if `-L' were specified.
    `..' is processed by removing the immediately previous pathname component
    back to a slash or the beginning of DIR.
    
    Exit Status:
    Returns 0 if the directory is changed, and if $PWD is set successfully when
    -P is used; non-zero otherwise.Child death or stopCommon shell variable names and usage.
    
    BASH_VERSION	Version information for this Bash.
    CDPATH	A colon-separated list of directories to search
    		for directories given as arguments to `cd'.
    GLOBIGNORE	A colon-separated list of patterns describing filenames to
    		be ignored by pathname expansion.
    HISTFILE	The name of the file where your command history is stored.
    HISTFILESIZE	The maximum number of lines this file can contain.
    HISTSIZE	The maximum number of history lines that a running
    		shell can access.
    HOME	The complete pathname to your login directory.
    HOSTNAME	The name of the current host.
    HOSTTYPE	The type of CPU this version of Bash is running under.
    IGNOREEOF	Controls the action of the shell on receipt of an EOF
    		character as the sole input.  If set, then the value
    		of it is the number of EOF characters that can be seen
    		in a row on an empty line before the shell will exit
    		(default 10).  When unset, EOF signifies the end of input.
    MACHTYPE	A string describing the current system Bash is running on.
    MAILCHECK	How often, in seconds, Bash checks for new mail.
    MAILPATH	A colon-separated list of filenames which Bash checks
    		for new mail.
    OSTYPE	The version of Unix this version of Bash is running on.
    PATH	A colon-separated list of directories to search when
    		looking for commands.
    PROMPT_COMMAND	A command to be executed before the printing of each
    		primary prompt.
    PS1		The primary prompt string.
    PS2		The secondary prompt string.
    PWD		The full pathname of the current directory.
    SHELLOPTS	A colon-separated list of enabled shell options.
    TERM	The name of the current terminal type.
    TIMEFORMAT	The output format for timing statistics displayed by the
    		`time' reserved word.
    auto_resume	Non-null means a command word appearing on a line by
    		itself is first looked for in the list of currently
    		stopped jobs.  If found there, that job is foregrounded.
    		A value of `exact' means that the command word must
    		exactly match a command in the list of stopped jobs.  A
    		value of `substring' means that the command word must
    		match a substring of the job.  Any other value means that
    		the command must be a prefix of a stopped job.
    histchars	Characters controlling history expansion and quick
    		substitution.  The first character is the history
    		substitution character, usually `!'.  The second is
    		the `quick substitution' character, usually `^'.  The
    		third is the `history comment' character, usually `#'.
    HISTIGNORE	A colon-separated list of patterns used to decide which
    		commands should be saved on the history list.
ContinueDefine local variables.
    
    Create a local variable called NAME, and give it VALUE.  OPTION can
    be any option accepted by `declare'.
    
    Local variables can only be used within a function; they are visible
    only to the function where they are defined and its children.
    
    Exit Status:
    Returns success unless an invalid option is supplied, a variable
    assignment error occurs, or the shell is not executing a function.Define or display aliases.
    
    Without arguments, `alias' prints the list of aliases in the reusable
    form `alias NAME=VALUE' on standard output.
    
    Otherwise, an alias is defined for each NAME whose VALUE is given.
    A trailing space in VALUE causes the next word to be checked for
    alias substitution when the alias is expanded.
    
    Options:
      -p	print all defined aliases in a reusable format
    
    Exit Status:
    alias returns true unless a NAME is supplied for which no alias has been
    defined.Define shell function.
    
    Create a shell function named NAME.  When invoked as a simple command,
    NAME runs COMMANDs in the calling shell's context.  When NAME is invoked,
    the arguments are passed to the function as $1...$n, and the function's
    name is in $FUNCNAME.
    
    Exit Status:
    Returns success unless NAME is readonly.Display directory stack.
    
    Display the list of currently remembered directories.  Directories
    find their way onto the list with the `pushd' command; you can get
    back up through the list with the `popd' command.
    
    Options:
      -c	clear the directory stack by deleting all of the elements
      -l	do not print tilde-prefixed versions of directories relative
    		to your home directory
      -p	print the directory stack with one entry per line
      -v	print the directory stack with one entry per line prefixed
    		with its position in the stack
    
    Arguments:
      +N	Displays the Nth entry counting from the left of the list
    		shown by dirs when invoked without options, starting with
    		zero.
    
      -N	Displays the Nth entry counting from the right of the list
    		shown by dirs when invoked without options, starting with
    		zero.
    
    Exit Status:
    Returns success unless an invalid option is supplied or an error occurs.Display information about builtin commands.
    
    Displays brief summaries of builtin commands.  If PATTERN is
    specified, gives detailed help on all commands matching PATTERN,
    otherwise the list of help topics is printed.
    
    Options:
      -d	output short description for each topic
      -m	display usage in pseudo-manpage format
      -s	output only a short usage synopsis for each topic matching
    		PATTERN
    
    Arguments:
      PATTERN	Pattern specifiying a help topic
    
    Exit Status:
    Returns success unless PATTERN is not found or an invalid option is given.Display information about command type.
    
    For each NAME, indicate how it would be interpreted if used as a
    command name.
    
    Options:
      -a	display all locations containing an executable named NAME;
    		includes aliases, builtins, and functions, if and only if
    		the `-p' option is not also used
      -f	suppress shell function lookup
      -P	force a PATH search for each NAME, even if it is an alias,
    		builtin, or function, and returns the name of the disk file
    		that would be executed
      -p	returns either the name of the disk file that would be executed,
    		or nothing if `type -t NAME' would not return `file'
      -t	output a single word which is one of `alias', `keyword',
    		`function', `builtin', `file' or `', if NAME is an alias,
    		shell reserved word, shell function, shell builtin, disk file,
    		or not found, respectively
    
    Arguments:
      NAME	Command name to be interpreted.
    
    Exit Status:
    Returns success if all of the NAMEs are found; fails if any are not found.Display or execute commands from the history list.
    
    fc is used to list or edit and re-execute commands from the history list.
    FIRST and LAST can be numbers specifying the range, or FIRST can be a
    string, which means the most recent command beginning with that
    string.
    
    Options:
      -e ENAME	select which editor to use.  Default is FCEDIT, then EDITOR,
    		then vi
      -l 	list lines instead of editing
      -n	omit line numbers when listing
      -r	reverse the order of the lines (newest listed first)
    
    With the `fc -s [pat=rep ...] [command]' format, COMMAND is
    re-executed after the substitution OLD=NEW is performed.
    
    A useful alias to use with this is r='fc -s', so that typing `r cc'
    runs the last command beginning with `cc' and typing `r' re-executes
    the last command.
    
    Exit Status:
    Returns success or status of executed command; non-zero if an error occurs.Display or set file mode mask.
    
    Sets the user file-creation mask to MODE.  If MODE is omitted, prints
    the current value of the mask.
    
    If MODE begins with a digit, it is interpreted as an octal number;
    otherwise it is a symbolic mode string like that accepted by chmod(1).
    
    Options:
      -p	if MODE is omitted, output in a form that may be reused as input
      -S	makes the output symbolic; otherwise an octal number is output
    
    Exit Status:
    Returns success unless MODE is invalid or an invalid option is given.Display possible completions depending on the options.
    
    Intended to be used from within a shell function generating possible
    completions.  If the optional WORD argument is supplied, matches against
    WORD are generated.
    
    Exit Status:
    Returns success unless an invalid option is supplied or an error occurs.Display process times.
    
    Prints the accumulated user and system times for the shell and all of its
    child processes.
    
    Exit Status:
    Always succeeds.Display status of jobs.
    
    Lists the active jobs.  JOBSPEC restricts output to that job.
    Without options, the status of all active jobs is displayed.
    
    Options:
      -l	lists process IDs in addition to the normal information
      -n	lists only processes that have changed status since the last
    		notification
      -p	lists process IDs only
      -r	restrict output to running jobs
      -s	restrict output to stopped jobs
    
    If -x is supplied, COMMAND is run after all job specifications that
    appear in ARGS have been replaced with the process ID of that job's
    process group leader.
    
    Exit Status:
    Returns success unless an invalid option is given or an error occurs.
    If -x is used, returns the exit status of COMMAND.Display the list of currently remembered directories.  Directories
    find their way onto the list with the `pushd' command; you can get
    back up through the list with the `popd' command.
    
    Options:
      -c	clear the directory stack by deleting all of the elements
      -l	do not print tilde-prefixed versions of directories relative
    	to your home directory
      -p	print the directory stack with one entry per line
      -v	print the directory stack with one entry per line prefixed
    	with its position in the stack
    
    Arguments:
      +N	Displays the Nth entry counting from the left of the list shown by
    	dirs when invoked without options, starting with zero.
    
      -N	Displays the Nth entry counting from the right of the list shown by
	dirs when invoked without options, starting with zero.DoneDone(%d)EMT instructionEnable and disable shell builtins.
    
    Enables and disables builtin shell commands.  Disabling allows you to
    execute a disk command which has the same name as a shell builtin
    without using a full pathname.
    
    Options:
      -a	print a list of builtins showing whether or not each is enabled
      -n	disable each NAME or display a list of disabled builtins
      -p	print the list of builtins in a reusable format
      -s	print only the names of Posix `special' builtins
    
    Options controlling dynamic loading:
      -f	Load builtin NAME from shared object FILENAME
      -d	Remove a builtin loaded with -f
    
    Without options, each NAME is enabled.
    
    To use the `test' found in $PATH instead of the shell builtin
    version, type `enable -n test'.
    
    Exit Status:
    Returns success unless NAME is not a shell builtin or an error occurs.Evaluate arithmetic expression.
    
    The EXPRESSION is evaluated according to the rules for arithmetic
    evaluation.  Equivalent to "let EXPRESSION".
    
    Exit Status:
    Returns 1 if EXPRESSION evaluates to 0; returns 0 otherwise.Evaluate arithmetic expressions.
    
    Evaluate each ARG as an arithmetic expression.  Evaluation is done in
    fixed-width integers with no check for overflow, though division by 0
    is trapped and flagged as an error.  The following list of operators is
    grouped into levels of equal-precedence operators.  The levels are listed
    in order of decreasing precedence.
    
    	id++, id--	variable post-increment, post-decrement
    	++id, --id	variable pre-increment, pre-decrement
    	-, +		unary minus, plus
    	!, ~		logical and bitwise negation
    	**		exponentiation
    	*, /, %		multiplication, division, remainder
    	+, -		addition, subtraction
    	<<, >>		left and right bitwise shifts
    	<=, >=, <, >	comparison
    	==, !=		equality, inequality
    	&		bitwise AND
    	^		bitwise XOR
    	|		bitwise OR
    	&&		logical AND
    	||		logical OR
    	expr ? expr : expr
    			conditional operator
    	=, *=, /=, %=,
    	+=, -=, <<=, >>=,
    	&=, ^=, |=	assignment
    
    Shell variables are allowed as operands.  The name of the variable
    is replaced by its value (coerced to a fixed-width integer) within
    an expression.  The variable need not have its integer attribute
    turned on to be used in an expression.
    
    Operators are evaluated in order of precedence.  Sub-expressions in
    parentheses are evaluated first and may override the precedence
    rules above.
    
    Exit Status:
    If the last ARG evaluates to 0, let returns 1; let returns 0 otherwise.Evaluate conditional expression.
    
    Exits with a status of 0 (true) or 1 (false) depending on
    the evaluation of EXPR.  Expressions may be unary or binary.  Unary
    expressions are often used to examine the status of a file.  There
    are string operators and numeric comparison operators as well.
    
    The behavior of test depends on the number of arguments.  Read the
    bash manual page for the complete specification.
    
    File operators:
    
      -a FILE        True if file exists.
      -b FILE        True if file is block special.
      -c FILE        True if file is character special.
      -d FILE        True if file is a directory.
      -e FILE        True if file exists.
      -f FILE        True if file exists and is a regular file.
      -g FILE        True if file is set-group-id.
      -h FILE        True if file is a symbolic link.
      -L FILE        True if file is a symbolic link.
      -k FILE        True if file has its `sticky' bit set.
      -p FILE        True if file is a named pipe.
      -r FILE        True if file is readable by you.
      -s FILE        True if file exists and is not empty.
      -S FILE        True if file is a socket.
      -t FD          True if FD is opened on a terminal.
      -u FILE        True if the file is set-user-id.
      -w FILE        True if the file is writable by you.
      -x FILE        True if the file is executable by you.
      -O FILE        True if the file is effectively owned by you.
      -G FILE        True if the file is effectively owned by your group.
      -N FILE        True if the file has been modified since it was last read.
    
      FILE1 -nt FILE2  True if file1 is newer than file2 (according to
                       modification date).
    
      FILE1 -ot FILE2  True if file1 is older than file2.
    
      FILE1 -ef FILE2  True if file1 is a hard link to file2.
    
    String operators:
    
      -z STRING      True if string is empty.
    
      -n STRING
         STRING      True if string is not empty.
    
      STRING1 = STRING2
                     True if the strings are equal.
      STRING1 != STRING2
                     True if the strings are not equal.
      STRING1 < STRING2
                     True if STRING1 sorts before STRING2 lexicographically.
      STRING1 > STRING2
                     True if STRING1 sorts after STRING2 lexicographically.
    
    Other operators:
    
      -o OPTION      True if the shell option OPTION is enabled.
      -v VAR         True if the shell variable VAR is set.
      -R VAR         True if the shell variable VAR is set and is a name
                     reference.
      ! EXPR         True if expr is false.
      EXPR1 -a EXPR2 True if both expr1 AND expr2 are true.
      EXPR1 -o EXPR2 True if either expr1 OR expr2 is true.
    
      arg1 OP arg2   Arithmetic tests.  OP is one of -eq, -ne,
                     -lt, -le, -gt, or -ge.
    
    Arithmetic binary operators return true if ARG1 is equal, not-equal,
    less-than, less-than-or-equal, greater-than, or greater-than-or-equal
    than ARG2.
    
    Exit Status:
    Returns success if EXPR evaluates to true; fails if EXPR evaluates to
    false or an invalid argument is given.Evaluate conditional expression.
    
    This is a synonym for the "test" builtin, but the last argument must
    be a literal `]', to match the opening `['.Execute a simple command or display information about commands.
    
    Runs COMMAND with ARGS suppressing  shell function lookup, or display
    information about the specified COMMANDs.  Can be used to invoke commands
    on disk when a function with the same name exists.
    
    Options:
      -p    use a default value for PATH that is guaranteed to find all of
            the standard utilities
      -v    print a description of COMMAND similar to the `type' builtin
      -V    print a more verbose description of each COMMAND
    
    Exit Status:
    Returns exit status of COMMAND, or failure if COMMAND is not found.Execute arguments as a shell command.
    
    Combine ARGs into a single string, use the result as input to the shell,
    and execute the resulting commands.
    
    Exit Status:
    Returns exit status of command or success if command is null.Execute commands as long as a test does not succeed.
    
    Expand and execute COMMANDS as long as the final command in the
    `until' COMMANDS has an exit status which is not zero.
    
    Exit Status:
    Returns the status of the last command executed.Execute commands as long as a test succeeds.
    
    Expand and execute COMMANDS as long as the final command in the
    `while' COMMANDS has an exit status of zero.
    
    Exit Status:
    Returns the status of the last command executed.Execute commands based on conditional.
    
    The `if COMMANDS' list is executed.  If its exit status is zero, then the
    `then COMMANDS' list is executed.  Otherwise, each `elif COMMANDS' list is
    executed in turn, and if its exit status is zero, the corresponding
    `then COMMANDS' list is executed and the if command completes.  Otherwise,
    the `else COMMANDS' list is executed, if present.  The exit status of the
    entire construct is the exit status of the last command executed, or zero
    if no condition tested true.
    
    Exit Status:
    Returns the status of the last command executed.Execute commands based on pattern matching.
    
    Selectively execute COMMANDS based upon WORD matching PATTERN.  The
    `|' is used to separate multiple patterns.
    
    Exit Status:
    Returns the status of the last command executed.Execute commands for each member in a list.
    
    The `for' loop executes a sequence of commands for each member in a
    list of items.  If `in WORDS ...;' is not present, then `in "$@"' is
    assumed.  For each element in WORDS, NAME is set to that element, and
    the COMMANDS are executed.
    
    Exit Status:
    Returns the status of the last command executed.Execute commands from a file in the current shell.
    
    Read and execute commands from FILENAME in the current shell.  The
    entries in $PATH are used to find the directory containing FILENAME.
    If any ARGUMENTS are supplied, they become the positional parameters
    when FILENAME is executed.
    
    Exit Status:
    Returns the status of the last command executed in FILENAME; fails if
    FILENAME cannot be read.Execute conditional command.
    
    Returns a status of 0 or 1 depending on the evaluation of the conditional
    expression EXPRESSION.  Expressions are composed of the same primaries used
    by the `test' builtin, and may be combined using the following operators:
    
      ( EXPRESSION )	Returns the value of EXPRESSION
      ! EXPRESSION		True if EXPRESSION is false; else false
      EXPR1 && EXPR2	True if both EXPR1 and EXPR2 are true; else false
      EXPR1 || EXPR2	True if either EXPR1 or EXPR2 is true; else false
    
    When the `==' and `!=' operators are used, the string to the right of
    the operator is used as a pattern and pattern matching is performed.
    When the `=~' operator is used, the string to the right of the operator
    is matched as a regular expression.
    
    The && and || operators do not evaluate EXPR2 if EXPR1 is sufficient to
    determine the expression's value.
    
    Exit Status:
    0 or 1 depending on value of EXPRESSION.Execute shell builtins.
    
    Execute SHELL-BUILTIN with arguments ARGs without performing command
    lookup.  This is useful when you wish to reimplement a shell builtin
    as a shell function, but need to execute the builtin within the function.
    
    Exit Status:
    Returns the exit status of SHELL-BUILTIN, or false if SHELL-BUILTIN is
    not a shell builtin..Exit %dExit a login shell.
    
    Exits a login shell with exit status N.  Returns an error if not executed
    in a login shell.Exit for, while, or until loops.
    
    Exit a FOR, WHILE or UNTIL loop.  If N is specified, break N enclosing
    loops.
    
    Exit Status:
    The exit status is 0 unless N is not greater than or equal to 1.Exit the shell.
    
    Exits the shell with a status of N.  If N is omitted, the exit status
    is that of the last command executed.File limitFloating point exceptionFormats and prints ARGUMENTS under control of the FORMAT.
    
    Options:
      -v var	assign the output to shell variable VAR rather than
    		display it on the standard output
    
    FORMAT is a character string which contains three types of objects: plain
    characters, which are simply copied to standard output; character escape
    sequences, which are converted and copied to the standard output; and
    format specifications, each of which causes printing of the next successive
    argument.
    
    In addition to the standard format specifications described in printf(1),
    printf interprets:
    
      %b	expand backslash escape sequences in the corresponding argument
      %q	quote the argument in a way that can be reused as shell input
      %(fmt)T	output the date-time string resulting from using FMT as a format
    	        string for strftime(3)
    
    The format is re-used as necessary to consume all of the arguments.  If
    there are fewer arguments than the format requires,  extra format
    specifications behave as if a zero value or null string, as appropriate,
    had been supplied.
    
    Exit Status:
    Returns success unless an invalid option is given or a write or assignment
    error occurs.GNU bash, version %s (%s)
GNU bash, version %s-(%s)
GNU long options:
General help using GNU software: <http://www.gnu.org/gethelp/>
Group commands as a unit.
    
    Run a set of commands in a group.  This is one way to redirect an
    entire set of commands.
    
    Exit Status:
    Returns the status of the last command executed.HFT input data pendingHFT monitor mode grantedHFT monitor mode retractedHFT sound sequence has completedHOME not setHangupI have no name!I/O readyIllegal instructionInformation requestInterruptKilledLicense GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
Mark shell variables as unchangeable.
    
    Mark each NAME as read-only; the values of these NAMEs may not be
    changed by subsequent assignment.  If VALUE is supplied, assign VALUE
    before marking as read-only.
    
    Options:
      -a	refer to indexed array variables
      -A	refer to associative array variables
      -f	refer to shell functions
      -p	display a list of all readonly variables or functions,
    		depending on whether or not the -f option is given
    
    An argument of `--' disables further option processing.
    
    Exit Status:
    Returns success unless an invalid option is given or NAME is invalid.Modify or display completion options.
    
    Modify the completion options for each NAME, or, if no NAMEs are supplied,
    the completion currently being executed.  If no OPTIONs are given, print
    the completion options for each NAME or the current completion specification.
    
    Options:
    	-o option	Set completion option OPTION for each NAME
    	-D		Change options for the "default" command completion
    	-E		Change options for the "empty" command completion
    
    Using `+o' instead of `-o' turns off the specified option.
    
    Arguments:
    
    Each NAME refers to a command for which a completion specification must
    have previously been defined using the `complete' builtin.  If no NAMEs
    are supplied, compopt must be called by a function currently generating
    completions, and the options for that currently-executing completion
    generator are modified.
    
    Exit Status:
    Returns success unless an invalid option is supplied or NAME does not
    have a completion specification defined.Modify shell resource limits.
    
    Provides control over the resources available to the shell and processes
    it creates, on systems that allow such control.
    
    Options:
      -S	use the `soft' resource limit
      -H	use the `hard' resource limit
      -a	all current limits are reported
      -b	the socket buffer size
      -c	the maximum size of core files created
      -d	the maximum size of a process's data segment
      -e	the maximum scheduling priority (`nice')
      -f	the maximum size of files written by the shell and its children
      -i	the maximum number of pending signals
      -k	the maximum number of kqueues allocated for this process
      -l	the maximum size a process may lock into memory
      -m	the maximum resident set size
      -n	the maximum number of open file descriptors
      -p	the pipe buffer size
      -q	the maximum number of bytes in POSIX message queues
      -r	the maximum real-time scheduling priority
      -s	the maximum stack size
      -t	the maximum amount of cpu time in seconds
      -u	the maximum number of user processes
      -v	the size of virtual memory
      -x	the maximum number of file locks
      -P	the maximum number of pseudoterminals
      -T	the maximum number of threads
    
    Not all options are available on all platforms.
    
    If LIMIT is given, it is the new value of the specified resource; the
    special LIMIT values `soft', `hard', and `unlimited' stand for the
    current soft limit, the current hard limit, and no limit, respectively.
    Otherwise, the current value of the specified resource is printed.  If
    no option is given, then -f is assumed.
    
    Values are in 1024-byte increments, except for -t, which is in seconds,
    -p, which is in increments of 512 bytes, and -u, which is an unscaled
    number of processes.
    
    Exit Status:
    Returns success unless an invalid option is supplied or an error occurs.Move job to the foreground.
    
    Place the job identified by JOB_SPEC in the foreground, making it the
    current job.  If JOB_SPEC is not present, the shell's notion of the
    current job is used.
    
    Exit Status:
    Status of command placed in foreground, or failure if an error occurs.Move jobs to the background.
    
    Place the jobs identified by each JOB_SPEC in the background, as if they
    had been started with `&'.  If JOB_SPEC is not present, the shell's notion
    of the current job is used.
    
    Exit Status:
    Returns success unless job control is not enabled or an error occurs.Null command.
    
    No effect; the command does nothing.
    
    Exit Status:
    Always succeeds.OLDPWD not setParse option arguments.
    
    Getopts is used by shell procedures to parse positional parameters
    as options.
    
    OPTSTRING contains the option letters to be recognized; if a letter
    is followed by a colon, the option is expected to have an argument,
    which should be separated from it by white space.
    
    Each time it is invoked, getopts will place the next option in the
    shell variable $name, initializing name if it does not exist, and
    the index of the next argument to be processed into the shell
    variable OPTIND.  OPTIND is initialized to 1 each time the shell or
    a shell script is invoked.  When an option requires an argument,
    getopts places that argument into the shell variable OPTARG.
    
    getopts reports errors in one of two ways.  If the first character
    of OPTSTRING is a colon, getopts uses silent error reporting.  In
    this mode, no error messages are printed.  If an invalid option is
    seen, getopts places the option character found into OPTARG.  If a
    required argument is not found, getopts places a ':' into NAME and
    sets OPTARG to the option character found.  If getopts is not in
    silent mode, and an invalid option is seen, getopts places '?' into
    NAME and unsets OPTARG.  If a required argument is not found, a '?'
    is placed in NAME, OPTARG is unset, and a diagnostic message is
    printed.
    
    If the shell variable OPTERR has the value 0, getopts disables the
    printing of error messages, even if the first character of
    OPTSTRING is not a colon.  OPTERR has the value 1 by default.
    
    Getopts normally parses the positional parameters ($0 - $9), but if
    more arguments are given, they are parsed instead.
    
    Exit Status:
    Returns success if an option is found; fails if the end of options is
    encountered or an error occurs.Print the name of the current working directory.
    
    Options:
      -L	print the value of $PWD if it names the current working
    		directory
      -P	print the physical directory, without any symbolic links
    
    By default, `pwd' behaves as if `-L' were specified.
    
    Exit Status:
    Returns 0 unless an invalid option is given or the current directory
    cannot be read.QuitRead a line from the standard input and split it into fields.
    
    Reads a single line from the standard input, or from file descriptor FD
    if the -u option is supplied.  The line is split into fields as with word
    splitting, and the first word is assigned to the first NAME, the second
    word to the second NAME, and so on, with any leftover words assigned to
    the last NAME.  Only the characters found in $IFS are recognized as word
    delimiters.
    
    If no NAMEs are supplied, the line read is stored in the REPLY variable.
    
    Options:
      -a array	assign the words read to sequential indices of the array
    		variable ARRAY, starting at zero
      -d delim	continue until the first character of DELIM is read, rather
    		than newline
      -e	use Readline to obtain the line in an interactive shell
      -i text	use TEXT as the initial text for Readline
      -n nchars	return after reading NCHARS characters rather than waiting
    		for a newline, but honor a delimiter if fewer than
    		NCHARS characters are read before the delimiter
      -N nchars	return only after reading exactly NCHARS characters, unless
    		EOF is encountered or read times out, ignoring any
    		delimiter
      -p prompt	output the string PROMPT without a trailing newline before
    		attempting to read
      -r	do not allow backslashes to escape any characters
      -s	do not echo input coming from a terminal
      -t timeout	time out and return failure if a complete line of
    		input is not read within TIMEOUT seconds.  The value of the
    		TMOUT variable is the default timeout.  TIMEOUT may be a
    		fractional number.  If TIMEOUT is 0, read returns
    		immediately, without trying to read any data, returning
    		success only if input is available on the specified
    		file descriptor.  The exit status is greater than 128
    		if the timeout is exceeded
      -u fd	read from file descriptor FD instead of the standard input
    
    Exit Status:
    The return code is zero, unless end-of-file is encountered, read times out
    (in which case it's greater than 128), a variable assignment error occurs,
    or an invalid file descriptor is supplied as the argument to -u.Read lines from a file into an array variable.
    
    A synonym for `mapfile'.Read lines from the standard input into an indexed array variable.
    
    Read lines from the standard input into the indexed array variable ARRAY, or
    from file descriptor FD if the -u option is supplied.  The variable MAPFILE
    is the default ARRAY.
    
    Options:
      -d delim	Use DELIM to terminate lines, instead of newline
      -n count	Copy at most COUNT lines.  If COUNT is 0, all lines are copied
      -O origin	Begin assigning to ARRAY at index ORIGIN.  The default index is 0
      -s count	Discard the first COUNT lines read
      -t	Remove a trailing DELIM from each line read (default newline)
      -u fd	Read lines from file descriptor FD instead of the standard input
      -C callback	Evaluate CALLBACK each time QUANTUM lines are read
      -c quantum	Specify the number of lines read between each call to
    			CALLBACK
    
    Arguments:
      ARRAY	Array variable name to use for file data
    
    If -C is supplied without -c, the default quantum is 5000.  When
    CALLBACK is evaluated, it is supplied the index of the next array
    element to be assigned and the line to be assigned to that element
    as additional arguments.
    
    If not supplied with an explicit origin, mapfile will clear ARRAY before
    assigning to it.
    
    Exit Status:
    Returns success unless an invalid option is given or ARRAY is readonly or
    not an indexed array.Record lockRemember or display program locations.
    
    Determine and remember the full pathname of each command NAME.  If
    no arguments are given, information about remembered commands is displayed.
    
    Options:
      -d	forget the remembered location of each NAME
      -l	display in a format that may be reused as input
      -p pathname	use PATHNAME as the full pathname of NAME
      -r	forget all remembered locations
      -t	print the remembered location of each NAME, preceding
    		each location with the corresponding NAME if multiple
    		NAMEs are given
    Arguments:
      NAME	Each NAME is searched for in $PATH and added to the list
    		of remembered commands.
    
    Exit Status:
    Returns success unless NAME is not found or an invalid option is given.Remove directories from stack.
    
    Removes entries from the directory stack.  With no arguments, removes
    the top directory from the stack, and changes to the new top directory.
    
    Options:
      -n	Suppresses the normal change of directory when removing
    		directories from the stack, so only the stack is manipulated.
    
    Arguments:
      +N	Removes the Nth entry counting from the left of the list
    		shown by `dirs', starting with zero.  For example: `popd +0'
    		removes the first directory, `popd +1' the second.
    
      -N	Removes the Nth entry counting from the right of the list
    		shown by `dirs', starting with zero.  For example: `popd -0'
    		removes the last directory, `popd -1' the next to last.
    
    The `dirs' builtin displays the directory stack.
    
    Exit Status:
    Returns success unless an invalid argument is supplied or the directory
    change fails.Remove each NAME from the list of defined aliases.
    
    Options:
      -a	remove all alias definitions
    
    Return success unless a NAME is not an existing alias.Remove jobs from current shell.
    
    Removes each JOBSPEC argument from the table of active jobs.  Without
    any JOBSPECs, the shell uses its notion of the current job.
    
    Options:
      -a	remove all jobs if JOBSPEC is not supplied
      -h	mark each JOBSPEC so that SIGHUP is not sent to the job if the
    		shell receives a SIGHUP
      -r	remove only running jobs
    
    Exit Status:
    Returns success unless an invalid option or JOBSPEC is given.Removes entries from the directory stack.  With no arguments, removes
    the top directory from the stack, and changes to the new top directory.
    
    Options:
      -n	Suppresses the normal change of directory when removing
    	directories from the stack, so only the stack is manipulated.
    
    Arguments:
      +N	Removes the Nth entry counting from the left of the list
    	shown by `dirs', starting with zero.  For example: `popd +0'
    	removes the first directory, `popd +1' the second.
    
      -N	Removes the Nth entry counting from the right of the list
    	shown by `dirs', starting with zero.  For example: `popd -0'
    	removes the last directory, `popd -1' the next to last.
    
    The `dirs' builtin displays the directory stack.Replace the shell with the given command.
    
    Execute COMMAND, replacing this shell with the specified program.
    ARGUMENTS become the arguments to COMMAND.  If COMMAND is not specified,
    any redirections take effect in the current shell.
    
    Options:
      -a name	pass NAME as the zeroth argument to COMMAND
      -c	execute COMMAND with an empty environment
      -l	place a dash in the zeroth argument to COMMAND
    
    If the command cannot be executed, a non-interactive shell exits, unless
    the shell option `execfail' is set.
    
    Exit Status:
    Returns success unless COMMAND is not found or a redirection error occurs.Report time consumed by pipeline's execution.
    
    Execute PIPELINE and print a summary of the real time, user CPU time,
    and system CPU time spent executing PIPELINE when it terminates.
    
    Options:
      -p	print the timing summary in the portable Posix format
    
    The value of the TIMEFORMAT variable is used as the output format.
    
    Exit Status:
    The return status is the return status of PIPELINE.Resume for, while, or until loops.
    
    Resumes the next iteration of the enclosing FOR, WHILE or UNTIL loop.
    If N is specified, resumes the Nth enclosing loop.
    
    Exit Status:
    The exit status is 0 unless N is not greater than or equal to 1.Resume job in foreground.
    
    Equivalent to the JOB_SPEC argument to the `fg' command.  Resume a
    stopped or background job.  JOB_SPEC can specify either a job name
    or a job number.  Following JOB_SPEC with a `&' places the job in
    the background, as if the job specification had been supplied as an
    argument to `bg'.
    
    Exit Status:
    Returns the status of the resumed job.Return a successful result.
    
    Exit Status:
    Always succeeds.Return an unsuccessful result.
    
    Exit Status:
    Always fails.Return from a shell function.
    
    Causes a function or sourced script to exit with the return value
    specified by N.  If N is omitted, the return status is that of the
    last command executed within the function or script.
    
    Exit Status:
    Returns N, or failure if the shell is not executing a function or script.Return the context of the current subroutine call.
    
    Without EXPR, returns "$line $filename".  With EXPR, returns
    "$line $subroutine $filename"; this extra information can be used to
    provide a stack trace.
    
    The value of EXPR indicates how many call frames to go back before the
    current one; the top frame is frame 0.
    
    Exit Status:
    Returns 0 unless the shell is not executing a shell function or EXPR
    is invalid.Returns the context of the current subroutine call.
    
    Without EXPR, returns RunningSegmentation faultSelect words from a list and execute commands.
    
    The WORDS are expanded, generating a list of words.  The
    set of expanded words is printed on the standard error, each
    preceded by a number.  If `in WORDS' is not present, `in "$@"'
    is assumed.  The PS3 prompt is then displayed and a line read
    from the standard input.  If the line consists of the number
    corresponding to one of the displayed words, then NAME is set
    to that word.  If the line is empty, WORDS and the prompt are
    redisplayed.  If EOF is read, the command completes.  Any other
    value read causes NAME to be set to null.  The line read is saved
    in the variable REPLY.  COMMANDS are executed after each selection
    until a break command is executed.
    
    Exit Status:
    Returns the status of the last command executed.Set Readline key bindings and variables.
    
    Bind a key sequence to a Readline function or a macro, or set a
    Readline variable.  The non-option argument syntax is equivalent to
    that found in ~/.inputrc, but must be passed as a single argument:
    e.g., bind '"\C-x\C-r": re-read-init-file'.
    
    Options:
      -m  keymap         Use KEYMAP as the keymap for the duration of this
                         command.  Acceptable keymap names are emacs,
                         emacs-standard, emacs-meta, emacs-ctlx, vi, vi-move,
                         vi-command, and vi-insert.
      -l                 List names of functions.
      -P                 List function names and bindings.
      -p                 List functions and bindings in a form that can be
                         reused as input.
      -S                 List key sequences that invoke macros and their values
      -s                 List key sequences that invoke macros and their values
                         in a form that can be reused as input.
      -V                 List variable names and values
      -v                 List variable names and values in a form that can
                         be reused as input.
      -q  function-name  Query about which keys invoke the named function.
      -u  function-name  Unbind all keys which are bound to the named function.
      -r  keyseq         Remove the binding for KEYSEQ.
      -f  filename       Read key bindings from FILENAME.
      -x  keyseq:shell-command	Cause SHELL-COMMAND to be executed when
    				KEYSEQ is entered.
      -X                 List key sequences bound with -x and associated commands
                         in a form that can be reused as input.
    
    Exit Status:
    bind returns 0 unless an unrecognized option is given or an error occurs.Set and unset shell options.
    
    Change the setting of each shell option OPTNAME.  Without any option
    arguments, list all shell options with an indication of whether or not each
    is set.
    
    Options:
      -o	restrict OPTNAMEs to those defined for use with `set -o'
      -p	print each shell option with an indication of its status
      -q	suppress output
      -s	enable (set) each OPTNAME
      -u	disable (unset) each OPTNAME
    
    Exit Status:
    Returns success if OPTNAME is enabled; fails if an invalid option is
    given or OPTNAME is disabled.Set export attribute for shell variables.
    
    Marks each NAME for automatic export to the environment of subsequently
    executed commands.  If VALUE is supplied, assign VALUE before exporting.
    
    Options:
      -f	refer to shell functions
      -n	remove the export property from each NAME
      -p	display a list of all exported variables and functions
    
    An argument of `--' disables further option processing.
    
    Exit Status:
    Returns success unless an invalid option is given or NAME is invalid.Set variable values and attributes.
    
    Declare variables and give them attributes.  If no NAMEs are given,
    display the attributes and values of all variables.
    
    Options:
      -f	restrict action or display to function names and definitions
      -F	restrict display to function names only (plus line number and
    		source file when debugging)
      -g	create global variables when used in a shell function; otherwise
    		ignored
      -p	display the attributes and value of each NAME
    
    Options which set attributes:
      -a	to make NAMEs indexed arrays (if supported)
      -A	to make NAMEs associative arrays (if supported)
      -i	to make NAMEs have the `integer' attribute
      -l	to convert NAMEs to lower case on assignment
      -n	make NAME a reference to the variable named by its value
      -r	to make NAMEs readonly
      -t	to make NAMEs have the `trace' attribute
      -u	to convert NAMEs to upper case on assignment
      -x	to make NAMEs export
    
    Using `+' instead of `-' turns off the given attribute.
    
    Variables with the integer attribute have arithmetic evaluation (see
    the `let' command) performed when the variable is assigned a value.
    
    When used in a function, `declare' makes NAMEs local, as with the `local'
    command.  The `-g' option suppresses this behavior.
    
    Exit Status:
    Returns success unless an invalid option is supplied or a variable
    assignment error occurs.Shell commands matching keyword `Shell commands matching keywords `Shell options:
Shift positional parameters.
    
    Rename the positional parameters $N+1,$N+2 ... to $1,$2 ...  If N is
    not given, it is assumed to be 1.
    
    Exit Status:
    Returns success unless N is negative or greater than $#.Signal %dSpecify how arguments are to be completed by Readline.
    
    For each NAME, specify how arguments are to be completed.  If no options
    are supplied, existing completion specifications are printed in a way that
    allows them to be reused as input.
    
    Options:
      -p	print existing completion specifications in a reusable format
      -r	remove a completion specification for each NAME, or, if no
    		NAMEs are supplied, all completion specifications
      -D	apply the completions and actions as the default for commands
    		without any specific completion defined
      -E	apply the completions and actions to "empty" commands --
    		completion attempted on a blank line
    
    When completion is attempted, the actions are applied in the order the
    uppercase-letter options are listed above.  The -D option takes
    precedence over -E.
    
    Exit Status:
    Returns success unless an invalid option is supplied or an error occurs.StoppedStopped (signal)Stopped (tty input)Stopped (tty output)Stopped(%s)Suspend shell execution.
    
    Suspend the execution of this shell until it receives a SIGCONT signal.
    Unless forced, login shells cannot be suspended.
    
    Options:
      -f	force the suspend, even if the shell is a login shell
    
    Exit Status:
    Returns success unless job control is not enabled or an error occurs.TIMEFORMAT: `%c': invalid format characterTerminatedThe mail in %s has been read
There are running jobs.
There are stopped jobs.
There is NO WARRANTY, to the extent permitted by law.These shell commands are defined internally.  Type `help' to see this list.
Type `help name' to find out more about the function `name'.
Use `info bash' to find out more about the shell in general.
Use `man -k' or `info' to find out more about commands not in this list.

A star (*) next to a name means that the command is disabled.

This is free software; you are free to change and redistribute it.Trap signals and other events.
    
    Defines and activates handlers to be run when the shell receives signals
    or other conditions.
    
    ARG is a command to be read and executed when the shell receives the
    signal(s) SIGNAL_SPEC.  If ARG is absent (and a single SIGNAL_SPEC
    is supplied) or `-', each specified signal is reset to its original
    value.  If ARG is the null string each SIGNAL_SPEC is ignored by the
    shell and by the commands it invokes.
    
    If a SIGNAL_SPEC is EXIT (0) ARG is executed on exit from the shell.  If
    a SIGNAL_SPEC is DEBUG, ARG is executed before every simple command.  If
    a SIGNAL_SPEC is RETURN, ARG is executed each time a shell function or a
    script run by the . or source builtins finishes executing.  A SIGNAL_SPEC
    of ERR means to execute ARG each time a command's failure would cause the
    shell to exit when the -e option is enabled.
    
    If no arguments are supplied, trap prints the list of commands associated
    with each signal.
    
    Options:
      -l	print a list of signal names and their corresponding numbers
      -p	display the trap commands associated with each SIGNAL_SPEC
    
    Each SIGNAL_SPEC is either a signal name in <signal.h> or a signal number.
    Signal names are case insensitive and the SIG prefix is optional.  A
    signal may be sent to the shell with "kill -signal $$".
    
    Exit Status:
    Returns success unless a SIGSPEC is invalid or an invalid option is given.Type `%s -c "help set"' for more information about shell options.
Type `%s -c help' for more information about shell builtin commands.
Unknown Signal #Unknown Signal #%dUnknown errorUnknown statusUnset values and attributes of shell variables and functions.
    
    For each NAME, remove the corresponding variable or function.
    
    Options:
      -f	treat each NAME as a shell function
      -v	treat each NAME as a shell variable
      -n	treat each NAME as a name reference and unset the variable itself
    		rather than the variable it references
    
    Without options, unset first tries to unset a variable, and if that fails,
    tries to unset a function.
    
    Some variables cannot be unset; also see `readonly'.
    
    Exit Status:
    Returns success unless an invalid option is given or a NAME is read-only.Urgent IO conditionUsage:	%s [GNU long option] [option] ...
	%s [GNU long option] [option] script-file ...
Use "%s" to leave the shell.
Use the `bashbug' command to report bugs.
User signal 1User signal 2Wait for job completion and return exit status.
    
    Waits for each process identified by an ID, which may be a process ID or a
    job specification, and reports its termination status.  If ID is not
    given, waits for all currently active child processes, and the return
    status is zero.  If ID is a a job specification, waits for all processes
    in that job's pipeline.
    
    If the -n option is supplied, waits for the next job to terminate and
    returns its exit status.
    
    Exit Status:
    Returns the status of the last ID; fails if ID is invalid or an invalid
    option is given.Wait for process completion and return exit status.
    
    Waits for each process specified by a PID and reports its termination status.
    If PID is not given, waits for all currently active child processes,
    and the return status is zero.  PID must be a process ID.
    
    Exit Status:
    Returns the status of the last PID; fails if PID is invalid or an invalid
    option is given.Window changedWrite arguments to the standard output.
    
    Display the ARGs on the standard output followed by a newline.
    
    Options:
      -n	do not append a newline
    
    Exit Status:
    Returns success unless a write error occurs.Write arguments to the standard output.
    
    Display the ARGs, separated by a single space character and followed by a
    newline, on the standard output.
    
    Options:
      -n	do not append a newline
      -e	enable interpretation of the following backslash escapes
      -E	explicitly suppress interpretation of backslash escapes
    
    `echo' interprets the following backslash-escaped characters:
      \a	alert (bell)
      \b	backspace
      \c	suppress further output
      \e	escape character
      \E	escape character
      \f	form feed
      \n	new line
      \r	carriage return
      \t	horizontal tab
      \v	vertical tab
      \\	backslash
      \0nnn	the character whose ASCII code is NNN (octal).  NNN can be
    		0 to 3 octal digits
      \xHH	the eight-bit character whose value is HH (hexadecimal).  HH
    		can be one or two hex digits
    
    Exit Status:
    Returns success unless a write error occurs.You have mail in $_You have new mail in $_[ arg... ][[ expression ]]`%c': bad command`%c': invalid format character`%c': invalid symbolic mode character`%c': invalid symbolic mode operator`%c': invalid time format specification`%s': cannot unbind`%s': invalid alias name`%s': invalid keymap name`%s': is a special builtin`%s': missing format character`%s': not a pid or valid job spec`%s': not a valid identifier`%s': unknown function name`)' expected`)' expected, found %s`:' expected for conditional expressionadd_process: pid %5ld (%s) marked as still aliveadd_process: process %5ld (%s) in the_pipelinealias [-p] [name[=value] ... ]all_local_variables: no function context at current scopeargumentargument expectedarray variable support requiredattempted assignment to non-variablebad array subscriptbad command typebad connectorbad jumpbad substitution: no closing "`" in %sbad substitution: no closing `%s' in %sbash home page: <http://www.gnu.org/software/bash>
bash_execute_unix_command: cannot find keymap for commandbg [job_spec ...]bind [-lpsvPSVX] [-m keymap] [-f filename] [-q name] [-u name] [-r keyseq] [-x keyseq:shell-command] [keyseq:readline-function or readline-command]brace expansion: cannot allocate memory for %sbrace expansion: failed to allocate memory for %d elementsbrace expansion: failed to allocate memory for `%s'break [n]bug: bad expassign tokenbuiltin [shell-builtin [arg ...]]caller [expr]can only `return' from a function or sourced scriptcan only be used in a functioncannot allocate new file descriptor for bash input from fd %dcannot create temp file for here-document: %scannot duplicate fd %d to fd %dcannot duplicate named pipe %s as fd %dcannot find %s in shared object %s: %scannot make child for command substitutioncannot make child for process substitutioncannot make pipe for command substitutioncannot make pipe for process substitutioncannot open named pipe %s for readingcannot open named pipe %s for writingcannot open shared object %s: %scannot redirect standard input from /dev/null: %scannot reset nodelay mode for fd %dcannot set and unset shell options simultaneouslycannot set gid to %d: effective gid %dcannot set terminal process group (%d)cannot set uid to %d: effective uid %dcannot simultaneously unset a function and a variablecannot suspendcannot suspend a login shellcannot use `-f' to make functionscannot use more than one of -anrwcase WORD in [PATTERN [| PATTERN]...) COMMANDS ;;]... esaccd [-L|[-P [-e]] [-@]] [dir]child setpgid (%ld to %ld)command [-pVv] command [arg ...]command_substitute: cannot duplicate pipe as fd 1compgen [-abcdefgjksuv] [-o option] [-A action] [-G globpat] [-W wordlist]  [-F function] [-C command] [-X filterpat] [-P prefix] [-S suffix] [word]complete [-abcdefgjksuv] [-pr] [-DE] [-o option] [-A action] [-G globpat] [-W wordlist]  [-F function] [-C command] [-X filterpat] [-P prefix] [-S suffix] [name ...]completion: function `%s' not foundcompopt [-o|+o option] [-DE] [name ...]conditional binary operator expectedcontinue [n]coproc [NAME] command [redirections]could not find /tmp, please create!cprintf: `%c': invalid format charactercurrentdeclare [-aAfFgilnrtux] [-p] [name[=value] ...]deleting stopped job %d with process group %lddescribe_pid: %ld: no such piddirectory stack emptydirectory stack indexdirs [-clpv] [+N] [-N]division by 0dynamic loading not availableecho [-n] [arg ...]echo [-neE] [arg ...]empty array variable nameenable [-a] [-dnps] [-f filename] [name ...]error getting terminal attributes: %serror importing function definition for `%s'error setting terminal attributes: %seval [arg ...]eval: maximum eval nesting level exceeded (%d)exec [-cl] [-a name] [command [arguments ...]] [redirection ...]exit [n]expected `)'exponent less than 0export [-fn] [name[=value] ...] or export -pexpression expectedexpression recursion level exceededfc [-e ename] [-lnr] [first] [last] or fc -s [pat=rep] [command]fg [job_spec]file descriptor out of rangefilename argument requiredfor (( exp1; exp2; exp3 )); do COMMANDS; donefor NAME [in WORDS ... ] ; do COMMANDS; doneforked pid %d appears in running job %dformat parsing problem: %sfree: called with already freed block argumentfree: called with unallocated block argumentfree: start and end chunk sizes differfree: underflow detected; mh_nbytes out of rangefunction name { COMMANDS ; } or name () { COMMANDS ; }future versions of the shell will force evaluation as an arithmetic substitutiongetcwd: cannot access parent directoriesgetopts optstring name [arg]hash [-lr] [-p pathname] [-dt] [name ...]hashing disabledhelp [-dms] [pattern ...]help not available in this versionhere-document at line %d delimited by end-of-file (wanted `%s')history [-c] [-d offset] [n] or history -anrw [filename] or history -ps arg [arg...]history positionhistory specificationhits	command
identifier expected after pre-increment or pre-decrementif COMMANDS; then COMMANDS; [ elif COMMANDS; then COMMANDS; ]... [ else COMMANDS; ] fiinitialize_job_control: getpgrp failedinitialize_job_control: line disciplineinitialize_job_control: setpgidinvalid arithmetic baseinvalid baseinvalid character %d in exportstr for %sinvalid hex numberinvalid numberinvalid octal numberinvalid signal numberjob %d started without job controljob_spec [&]jobs [-lnprs] [jobspec ...] or jobs -x command [args]kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]last command: %s
let arg [arg ...]limitline %d: line editing not enabledload function for %s returns failure (%d): not loadedlocal [option] name[=value] ...logout
logout [n]loop countmake_here_document: bad instruction type %dmake_local_variable: no function context at current scopemake_redirection: redirection instruction `%d' out of rangemalloc: block on free list clobberedmalloc: failed assertion: %s
mapfile [-d delim] [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]maximum here-document count exceededmigrate process to another CPUmissing `)'missing `]'missing hex digit for \xmissing unicode digit for \%cnetwork operations not supportedno `=' in exportstr for %sno closing `%c' in %sno command foundno help topics match `%s'.  Try `help help' or `man -k %s' or `info %s'.no job controlno job control in this shellno match: %sno other directoryno other options allowed with `-x'not currently executing completion functionnot login shell: use `exit'octal numberonly meaningful in a `for', `while', or `until' looppipe errorpop_scope: head of shell_variables not a temporary environment scopepop_var_context: head of shell_variables not a function contextpop_var_context: no global_variables contextpopd [-n] [+N | -N]power failure imminentprint_command: bad connector `%d'printf [-v var] format [arguments]progcomp_insert: %s: NULL COMPSPECprogramming errorpushd [-n] [+N | -N | dir]pwd [-LP]read [-ers] [-a array] [-d delim] [-i text] [-n nchars] [-N nchars] [-p prompt] [-t timeout] [-u fd] [name ...]read error: %d: %sreadarray [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]readonly [-aAf] [name[=value] ...] or readonly -prealloc: called with unallocated block argumentrealloc: start and end chunk sizes differrealloc: underflow detected; mh_nbytes out of rangerecursion stack underflowredirection error: cannot duplicate fdregister_alloc: %p already in table as allocated?
register_alloc: alloc table is full with FIND_ALLOC?
register_free: %p already in table as free?
restrictedreturn [n]run_pending_traps: bad value in trap_list[%d]: %prun_pending_traps: signal handler is SIG_DFL, resending %d (%s) to myselfsave_bash_input: buffer already exists for new fd %dselect NAME [in WORDS ... ;] do COMMANDS; doneset [-abefhkmnptuvxBCHP] [-o option-name] [--] [arg ...]setlocale: %s: cannot change locale (%s)setlocale: %s: cannot change locale (%s): %ssetlocale: LC_ALL: cannot change locale (%s)setlocale: LC_ALL: cannot change locale (%s): %sshell level (%d) too high, resetting to 1shift [n]shift countshopt [-pqsu] [-o] [optname ...]sigprocmask: %d: invalid operationsource filename [arguments]start_pipeline: pgrp pipesuspend [-f]syntax errorsyntax error in conditional expressionsyntax error in conditional expression: unexpected token `%s'syntax error in expressionsyntax error near `%s'syntax error near unexpected token `%s'syntax error: `((%s))'syntax error: `;' unexpectedsyntax error: arithmetic expression requiredsyntax error: invalid arithmetic operatorsyntax error: operand expectedsyntax error: unexpected end of filesystem crash imminenttest [expr]time [-p] pipelinetoo many argumentstrap [-lp] [[arg] signal_spec ...]trap_handler: bad signal %dtype [-afptP] name [name ...]typeset [-aAfFgilnrtux] [-p] name[=value] ...ulimit [-SHabcdefiklmnpqrstuvxPT] [limit]umask [-p] [-S] [mode]unalias [-a] name [name ...]unexpected EOF while looking for `]]'unexpected EOF while looking for matching `%c'unexpected EOF while looking for matching `)'unexpected argument `%s' to conditional binary operatorunexpected argument `%s' to conditional unary operatorunexpected argument to conditional binary operatorunexpected argument to conditional unary operatorunexpected token %d in conditional commandunexpected token `%c' in conditional commandunexpected token `%s' in conditional commandunexpected token `%s', conditional binary operator expectedunexpected token `%s', expected `)'unknownunknown command errorunset [-f] [-v] [-n] [name ...]until COMMANDS; do COMMANDS; donevalue too great for basevariables - Names and meanings of some shell variableswait [-n] [id ...]wait [pid ...]wait: pid %ld is not a child of this shellwait_for: No record of process %ldwait_for_job: job %d is stoppedwaitchld: turning on WNOHANG to avoid indefinite blockwarning: warning: %s: %swarning: -C option may not work as you expectwarning: -F option may not work as you expectwhile COMMANDS; do COMMANDS; donewrite error: %sxtrace fd (%d) != fileno xtrace fp (%d)xtrace_set: %d: invalid file descriptorxtrace_set: NULL file pointer{ COMMANDS ; }Project-Id-Version: bash 4.4-beta1
Report-Msgid-Bugs-To: 
POT-Creation-Date: 2016-09-10 12:42-0400
PO-Revision-Date: 2015-10-26 00:32-0400
Last-Translator: Mingye Wang (Arthur2e5) <arthur200126@gmail.com>
Language-Team: Chinese (simplified) <i18n-zh@googlegroups.com>
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Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Language: zh_CN
Plural-Forms: nplurals=1; plural=0;
X-Generator: Poedit 1.8.5
 等待输入超时:自动注销
	-%s 或 -o <选项>
	-irsD 或 -c <命令> 或 -O <shopt 选项>		(仅适合调用)

malloc: %s:%d: 断言已修补
  (工作目录: %s) (核心已转储)行$%s: 无法这样赋值%c%c: 无效的选项%d: 无效的文件描述符: %s%s 可以被调用,通过%s 有空的 exportstr%s 是 %s
%s 是函数
%s 是 shell 内建
%s 是 shell 关键字
%s 是特殊 shell 内建
%s 是 `%s' 的别名
%s 已被录入哈希表 (%s)
%s 未与任何键绑定。
%s 越界%s%s%s: %s (错误符号是 "%s")%s: %s%s: %s 越界%s: %s: 解释器错误%s: %s: 无法作为文件打开%s: %s: 兼容版本数值越界%s: %s: 追踪文件描述符的值无效%s: %s: 为关联数组赋值时必须使用下标%s: %s:%d: 无法分配 %lu 字节%s: %s:%d: 无法分配 %lu 字节 (已分配 %lu 字节)%s: 是一个目录%s: 模糊的任务声明%s: 模糊的重定向%s: 参数必须是进程或任务 ID%s: 错误的网络路径声明%s: 错误的替换%s: 需要二元表达式%s: 无法分配 %lu 字节%s: 无法分配 %lu 字节 (已分配 %lu 字节)%s: 无法将文件描述符赋值给变量%s: 无法将链表赋值给数组成员%s: 无法为非数字的索引赋值%s: 无法将关联数组转化为索引数组%s: 无法将索引数组转化为关联数组%s: 无法创建: %s%s: 无法删除: %s%s: 无法以这种方式销毁数组变量%s: 无法执行二进制文件%s: 无法执行二进制文件: %s%s: 无法执行: %s%s: 无法导出%s: 无法获取 limit 值: %s%s: 无法修改 limit 值: %s%s: 无法打开临时文件: %s%s: 无法打开: %s%s: 无法覆盖已存在的文件%s: 无法读取: %s%s: 无法取消设定%s: 无法取消设定: 只读 %s%s: 循环变量名引用%s: 未找到命令%s: 获取当前目录时出错: %s: %s
%s: 表达式错误
%s: 文件太大%s: 文件未找到%s: 第一个非空字符不是 `"'%s: 哈希表为空
%s: 历史扩展失败%s: 未知主机%s: 非法选项 -- %c
%s: inlib 失败%s: 需要整数表达式%s: 无效的动作名%s: 无效参数%s: 无效的数组基数%s: 无效的关联数组键%s: 无效的回调量子%s: 无效的文件描述符声明%s: 无效的间接展开%s: 无效的 limit 参数%s: 无效的行数%s: 无效选项%s: 无效的选项名%s: 无效的服务%s: 无效的 shell 选项名%s: 无效的信号声明%s: 无效的超时声明%s: 无效的变量名%s: 无效的引用变量名%s: 是一个目录%s: 任务 %d 已在后台%s: 任务已经终止%s: 行 %d: %s: 超出最大函数嵌套层数 (%d)%s: 超出最大 source 嵌套层数 (%d)%s: 缺少冒号分隔符%s: 不允许名称引用变量引用自身%s: 没有补全声明%s: 无任务控制%s: 无此任务%s: 不是函数%s: 不是常规文件%s: 不是 shell 内建%s: 不是数组变量%s: 不是一个索引数组%s: 未以动态方式加载%s: 未找到%s: 需要数字参数%s: 选项需要一个参数%s: 选项需要一个参数 -- %c
%s: 参数为空或未设置%s: 引号内的复合数组赋值已被弃用%s: 只读函数%s: 只读变量%s: 引用变量不能为数组%s: 受限的%s: 受限的: 无法重定向输出%s: 受限的: 无法在命令名中使用 `/'%s: 子串表达式 < 0%s: 需要一元表达式%s: 未绑定的变量%s: 用法:%s: 变量不可赋值(( 表达式 ))(核心已转储)(当前工作目录:%s)
. 文件名 [参数]没有网络时不支持 /dev/(tcp|udp)/host/port/tmp 必须为有效的目录名<无当前目录>放弃指令中止...将目录添加到栈中。
    
    将目录添加到目录栈顶,或着旋转栈直到当前工作目录成为
    新的栈顶。不带参数时,交换栈顶的两个目录。
    
    选项:
      -n	抑制添加目录至栈时通常的改变目录操作,从而仅对栈
    	进行操作。
    
    参数:
      +N	旋转栈从而第 N 个目录 (`dirs' 显示的列表中左起,从零开始)
    	将移动到栈顶。
    
      -N	旋转栈从而第 N 个目录 (`dirs' 显示的列表中右起,从零开始)
    	将移动到栈顶。
    
      dir	将 DIR 目录添加到栈顶,并且使其成为当前工作目录。
    
    `dirs' 内建显示目录栈。
    
    退出状态:
    返回成功,除非使用了无效的参数或者目录转换失败。在目录栈顶部加入一个目录,或者论询
    目录栈,是当前工作目录成为新的栈顶
    不带参数时,交换栈顶的两个目录。
    
    选项:
      -n	抑制增加栈中目录时通常的改变目录的操作,
    	从而只有栈被操作。
    
    参数:
      +N	轮转栈使得第N个目录(`dirs' 的
    	输出列表中左起,从0开始)
    	升至栈顶。
    
      -N	轮转栈使得第N个目录(`dirs' 的
    	输出列表中右起,从0开始)
    	升至栈顶
    
      dir	添加目录至栈顶,并
    	使其成为新的当前工作目录。
    
    `dirs' 内建命令显示目录栈.报警(分析)报警(虚拟)闹钟算术 for 循环。
    
    等价于
    	(( EXP1 ))
    	while (( EXP2 )); do
    		COMMANDS
    		(( EXP3 ))
    	done
    EXP1、EXP2 和 EXP3都是算术表达式。如果省略任何表达式,
    则等同于使用了估值为1的表达式。
    
    退出状态:
    返回最后执行的命令的状态。断点追踪/陷阱错误的系统调用伪信号管道破裂总线错误CPU 限制改变 shell 工作目录。
    
    改变当前目录至 DIR 目录。默认的 DIR 目录是 shell 变量 HOME
    的值。
    
    变量 CDPATH 定义了含有 DIR 的目录的搜索路径,其中不同的目录名称由冒号 (:)分隔。
    一个空的目录名称表示当前目录。如果要切换到的 DIR 由斜杠 (/) 开头,则 CDPATH
    变量不会被使用。
    
    如果路径找不到,并且 shell 选项 `cdable_vars' 被设定,则参数词被假定为一个
    变量名。如果该变量有值,则它的值被当作 DIR 目录。
    
    选项:
        -L	强制跟随符号链接: 在处理 `..' 之后解析 DIR 中的符号链接。
        -P	使用物理目录结构而不跟随符号链接: 在处理 `..' 之前解析 DIR 中的符号链接。
        -e	如果使用了 -P 参数,但不能成功确定当前工作目录时,返回非零的返回值。
        -@	在支持拓展属性的系统上,将一个有这些属性的文件当作有文件属性的目录。
    
    默认情况下跟随符号链接,如同指定 `-L'。
    `..' 使用移除向前相邻目录名成员直到 DIR 开始或一个斜杠的方式处理。
    
    退出状态:
    如果目录改变,或在使用 -P 选项时 $PWD 修改成功时返回 0,否则非零。子进程已死或者停止常用 shell 变量名称和使用。
    
    BASH_VERSION	当前 Bash 的版本信息。
    CDPATH	用于 `cd' 命令参数搜索的分号分隔的目录列表
    GLOBIGNORE	路径扩展时忽略的文件名匹配模式列表,
    		以分号分隔。
    HISTFILE	您的命令历史存放的文件名称。
    HISTFILESIZE	历史文件最多可以保存的行数。
    HISTSIZE	一个运行的 shell 最多可以访问的历史命令行数。
    HOME	您的登录目录的完整路径。
    HOSTNAME	当前主机的主机名。
    HOSTTYPE	当前版本的 BASH 在其之上运行的 CPU 类型。
    IGNOREEOF	控制 shell 收到文件结束符作为单一输入后的
    		动作。如果设定这个变量,则它的值是 shell 退出之前在
    		一个空行上可以连续看到的文件结束符数量(默认为10)。
    		未设定时,文件结束符标志着输入的结束。
    MACHTYPE	描述当前运行 Bash 的系统的字符串。
    MAILCHECK	Bash 检测新邮件的频率,以秒为单位。
    MAILPATH	Bash 从中检测新邮件的文件列表,以分号分隔。
    OSTYPE	运行 Bash 的 Unix 版本。
    PATH	当寻找命令时搜索的目录列表,以冒号分隔。
    PROMPT_COMMAND	打印每一个主提示符之前执行的命
    		令。
    PS1		主提示符字符串。
    PS2		从提示符字符串。
    PWD		当前目录的完整路径。
    SHELLOPTS	已启用的 shell 选项列表,以冒号分隔。
    TERM	当前终端类型的名称。
    TIMEFORMAT	以关键则 `time' 显示的时间统计信息的输出
    		格式。
    auto_resume	非空时,一个单独的命令词会首先被在当前
    		停止的任务列表中搜索。如果找到则该任务被置于前台。
    		如果值为 `exact' 则意味着命令词必须精确匹配停止任务
    		列表中的命令。如果值为 `substring' 则意味着命令词必
    		须匹配任务的一个子字符串。任何其他的值意味着命令词
    		必须是停止任务的一个前缀。
    histchars	控制历史展开和快速替换的字符。第一个字符是
    		历史替换字符,通常是 `!'。第二个字符是快速替换字符,
    		通常是 `^'。第三个是历史注释字符,通常是 `#'。
    HISTIGNORE	用于决定哪些命令被存入历史文件的模式
    		列表,以冒号分隔。
继续定义本地变量。
    
    创建一个以 NAME 为名称的变量,并且将 VALUE 赋值给它。
    OPTION 选项可以是任何能被 `declare' 接受的选项。
    
    本地变量只能在函数内部被使用,它们只能在定义它们的函数内
    部以及子函数中可见。
    
    退出状态:
    返回成功,除非使用了无效的选项、发生了赋值错误或者 shell 不在执行一个函数。定义或显示别名。
    
    不带参数时,`alias' 以可重用的格式
    `alias 名称=值'在标准输出设备上打印别名列表。
    
    否则,对于每个给定值的名称定义一个别名。
    值末尾的空格会使下一个词被检测作为别名替换展开。
    
    选项:
      -p	以可重用的格式打印所有的已定义的别名
    
    退出状态:
    除非一个没有定义的名字被作为参数提供,否则 alias 
    返回值为真。定义 shell 函数。
    
    创建一个以 NAME 为名的 shell 函数。当作为一个简单的命令启用时,
    NAME 函数执行调用 shell 的上下文中的 COMMANDs 命令。当 NAME
    被启用时,参数作为 $1...$n 被传递给函数,函数的名字储存在变量
    $FUNCNAME 中。
    
    退出状态:
    返回成功除非 NAME 为只读。显示目录栈。
    
    显示当前记住的目录列表。通过 `pushd' 命令可以将目录存入列表
    中;`popd' 命令可用于遍历弹出列表。
    
    选项:
      -c	删除所有元素以清空目录栈
      -l	不打印与主目录相关的波浪号前缀的目录
      -p	每行一个条目打印目录栈
      -v	每行一个条目,以栈中位置为前缀打印目录栈
    
    参数:
      +N	显示 dirs 不带选项启动时显示的目录列表左起中第
    	N 个目录,从零开始。
    
      -N	显示 dirs 不带选项启动时显示的目录列表右起中第
    	N 个目录,从零开始。
    
    退出状态:
    返回成功,除非使用了无效的选项或者发生错误。显示内建命令的相关信息。
    
    显示内建命令的简略信息。如果指定了 PATTERN 模式,
    给出所有匹配 PATTERN 模式的命令的详细帮助,否则打
    印一个帮助主题列表
    
    选项:
      -d	输出每个主题的简短描述
      -m	以伪 man 手册的格式显示使用方法
      -s	为每一个匹配 PATTERN 模式的主题仅显示一个用法
    	简介
    
    参数:
      PATTERN	Pattern 模式指定一个帮助主题
    
    退出状态:
    返回成功,除非 PATTERN 模式没有找到或者使用了无效选项。显示命令类型的信息。
    
    对于每一个 NAME 名称,指示如果作为命令它将如何被解释。
    
    选项:
      -a	显示所有包含名称为 NAME 的可执行文件的位置;
    		包括别名、内建和函数。仅当 `-p' 选项没有使用时
      -f	抑制 shell 函数查询
      -P	为每个 NAME 名称惊醒 PATH 路径搜索,即使它是别名、
    		内建或函数,并且返回将被执行的磁盘上文件的名称。
      -p	返回将被执行的磁盘上文件的名称,或者当 `type -t NAME'
    	不返回 `file' 时,不返回任何值。
      -t	返回下列词中的任何一个 `alias'、`keyword'、
    	`function'、`builtin'、`file' 或者 `',相应地如果 NAME 是
    	一个别名、shell 保留字、shell 函数、shell 内建、
    	磁盘文件或没有找到。
    
    参数:
      NAME	将要解析的命令。
    
    退出状态:
    如果所有的 NAME 命令都找到则返回成功;任何一个找不到则失败。从历史列表中显示或者执行命令。
    
    fc 被用于从历史列表中列出或者重新编辑并执行命令。
    FIRST 和 LAST 变量可以是数字用于指定范围,或者 FIRST 可以是
    字符串,意味着以这个字符串打头的最近的一个命令。
    
    
    选项:
      -e ENAME	选择使用哪个编辑器。默认的是 FCEDIT, 然后是 EDITOR,
    		然后是 vi
      -l 	列出行而不编辑
      -n	列举时省略行号
      -r	反转行的顺序(最新行在前)
    
    用 `fc -s [模式=替换 ...] [命令]' 的格式,COMMAND 命令会在 OLD=NEW
    替换之后被重新执行。
    
    r='fc -s' 是一个有用的别名,这样的话输入 `r cc'会执行最后一个以 `cc'
    开头的命令,输入 `r'会重新执行最后一个命令。
    
    
    退出状态:
    返回成功,或者执行的命令的状态;如果错误发生则返回非零。显示或设定文件模式掩码。
    
    设定用户文件创建掩码为 MODE 模式。如果省略了 MODE,则
    打印当前掩码的值。
    
    如果 MODE 模式以数字开头,则被当作八进制数解析;否则是一个
    chmod(1) 可接收的符号模式串。
    
    选项:
      -p	如果省略 MODE 模式,以可重用为输入的格式输入
      -S	以符号形式输出,否则以八进制数格式输出
    
    退出状态:
    返回成功,除非使用了无效的 MODE 模式或者选项。依据选项显示可能的补全。
    
    意图在能产生可能的补全的 shell 函数内部使用。
    如果提供了可选的 WORD 参数,则产生按照 WORD
    进行的匹配。
    
    退出状态:
    除非使用了无效选项或者错误发生,否则返回成功。显示进程时间
    
    打印 shell 及其所有子进程的累计用户空间和
    系统空间执行时间。
    
    退出状态
    总是成功。显示任务状态。
    
    列出活动的任务。JOBSPEC 限制仅输出指定的任务。
    不带选项时,所有活动任务的状态都会显示。
    
    选项:
      -l	在正常信息基础上列出进程号
      -n	仅列出上次通告之后改变了状态的进程
      -p	仅列出进程号
      -r	限制仅输出运行中的任务
      -s	限制仅输出停止的任务
    
    如果使用了 -x 选项,ARG 参数中的所有任务声明会被替换为该任务
    的进程组头领的进程号,然后执行 COMMAND 命令。
    
    退出状态:
    返回成功,除非使用了无效的选项或者有错误发生。
    如果使用 -x 选项,则返回 COMMAND 命令的退出状态。显示当前记住的目录列表。 目录
    通过 `pushd' 命令加入这个列表;您可以
    使用 `popd' 命令对列表进行遍历。
    
    选项:
      -c	删除所有元素以清除目录栈
      -l	不打印与家目录相关的以波浪号
    	为前缀的目录
      -p	每行一个条目打印目录栈
      -v	以栈位置为前缀,每行一个条目
    	打印目录栈
    
    参数:
      +N	以 dirs 不带选项输出的顺序显示列表从左起第N个条目,
    	从 0 开始。
    
      -N	以 dirs 不带选项输出的顺序显示列表从右起第N个项目,
	从 0 开始。已完成已完成(%d)模拟器陷阱指令启用和禁用 shell 内建。
    
    启用和禁用 shell 的内建命令。禁用使您能够执行一个和内建
    命令同名的磁盘上的命令,而无须使用完整的路径名。
    
    
    选项:
      -a	打印一个内建的列表,并显示其中每一个是否启用
      -n	禁用每一个 NAME 内建或者显示一个被禁用的内建的列表
      -p	以可重用的格式打印一个内建的列表
      -s	仅打印Posix `special'  内建的名称
    
    控制动态加载的选项:
      -f	从共享对象 FILENAME 文件中加载 NAME 内建
      -d	删除以 -f 选项加载的内建
    
    不带选项时,每一个 NAME 内建都被启用。
    
    如果要使用 $PATH 中找到的 `test' 而不是 shell 内建的版本,
    输入 `enable -n test'。
    
    退出状态:
    返回成功,除非 NAME 不是一个 shell 内建或者有错误发生。估值算术表达式。
    
    表达式按照算术法则进行估值。
    等价于 "let 表达式".
    
    退出状态
    如果表达式估值为0则返回 1;否则返回0。估值算术表达式。
    
    将每个 ARG 参赛作为算术表达式来估值。估值的计算以定宽的整
    数完成,不带溢出检测,不过除 0 是被置陷阱的并且会报一个错
    误。下列操作符被按照相同的算术优先级组合。列表的顺序按照
    优先级从高至低。
    
    
    	id++, id--	变量后置加,后置减
    	++id, --id	变量前置加,前置减
    	-, +		一元减法,一元加法
    	!, ~		逻辑和位取反
    	**		指数
    	*, /, %		乘法,除法,取余数
    	+, -		增加,减少
    	<<, >>		向左和向右按位移位
    	<=, >=, <, >	比较
    	==, !=		等于,不等于
    	&		按位与
    	^		按位异或
    	|		按位或
    	&&		逻辑与
    	||		逻辑或
    	expr ? expr : expr
    			条件操作符
    	=, *=, /=, %=,
    	+=, -=, <<=, >>=,
    	&=, ^=, |=	赋值
    
    Shell 变量允许作为操作数。表达式中的变量的名称会被取代以值
    (强制转换为定宽的整数)。表达式中的变量不需要打开整数属性。
    
    操作符按照优先级进行估值。括号中的子表达式将被先估值,并可取代上述表达式规则。
    
    退出状态:
    如果最后一个 ARG 参数估值为 0,则 let 返回 1; 否则 let 返回 0。对条件表达式进行估值。
    
    根据 EXPR 表达式的估值以状态 0 (真) 或 1 (伪) 退出。
    表达式可以是一元或者二元的。一元表达式通常用于检测
    文件状态。同时还有字符串操作符和数字比较操作符。
    
    文件操作符:
    
      -a 文件        如果文件存在则为真。
      -b 文件        如果文件为块特殊文件则为真。
      -c 文件        如果文件为字符特殊文件则为真。
      -d 文件        如果文件为目录则为真。
      -e 文件        如果文件存在则为真。
      -f 文件        如果文件存在且为常规文件则为真。
      -g 文件        如果文件的组属性设置打开则为真。
      -h 文件        如果文件为符号链接则为真。
      -L 文件        如果文件为符号链接则为真。
      -k 文件        如果文件的粘滞 (sticky) 位设定则为真。
      -p 文件        如果文件为命名管道则为真。
      -r 文件        如果文件对于您是可读的则为真。
      -s 文件        如果文件存在且不为空则为真。
      -S 文件        如果文件是套接字则为真。
      -t 文件描述符   如果文件描述符在一个终端上打开则为真。
      -u 文件        如果文件的用户数行设置打开则为真。
      -w 文件        如果文件对您是可写的则为真
      -x 文件        如果文件对您是可执行的则为真。
      -O 文件        如果文件是被您所有的则为真。
      -G 文件        如果文件被您的组所有则为真。
      -N 文件        如果文件上次被读取之后修改过则为真。
    
      FILE1 -nt FILE2  如果 file1 文件新于 file2 文件则为真(根据
                       修改日期)。
    
      FILE1 -ot FILE2  如果 file1 文件旧于 file2 文件则为真。
    
      FILE1 -ef FILE2  如果 file1 文件是 file2 文件的硬链接则为真。
    
    字符串操作符
    
      -z 字符串      如果字符串为空则为真。
    
      -n 字符串
         字符串      如果字符串不为空则为真。
    
      STRING1 = STRING2
                     如果 string1 和 string2 字符串相同则为真。
      STRING1 != STRING2
                     如果 string1 和 string2 字符串不相同则为真。
      STRING1 < STRING2
                     如果按字典排序 string1 在 string2 串之前则为真。
      STRING1 > STRING2
                     如果按字典排序 string1 在 string2 串之前则为真。
    
    其他操作符:
    
      -o 选项        如果指定 shell 选项启用则为真。
      -v VAR         如果指定 Shell 变量 VAR 已赋值则为真。
      -R VAR         如果指定 Shell 变量 VAR 已赋值且为名称引用则为真。
      ! EXPR         如果表达式 expr 为假则为真。
      EXPR1 -a EXPR2 如果 expr1 和 expr2 都为真则为真。
      EXPR1 -o EXPR2 如果 expr1 和 expr2 有一个为真则为真。
    
      arg1 OP arg2   算术测试。OP操作符可以是 -eq、-ne、
                     -lt、-le、-gt、或 -ge 中的一个。
    
    二元算术操作返回真,如果 ARG1 参数等于、不等于、
    小于、小于等于、大于、或者大于等于 ARG2 参数。
    
    退出状态:
    如果 EXPR 表达式估值为真则返回成功;如果 EXPR 表达式估值
    为假或者使用了无效的参数则返回失败。估值条件表达式。
    
    是内建命令 "test" 的同义词,但是最后一个参数必须是
    字符 `]',以匹配起始的 `['。执行一个简单命令或者显示命令的相关信息。
    
    带 ARGS 参数运行 COMMAND 命令且抑制 shell 函数查询,或显示
    指定的 COMMAND 命令的信息。可以在存在相同名称的函数定义的
    情况下被用于启动磁盘上的命令。
    
    选项:
      -p	使用 PATH 变量的一个默认值以确保所有的标准工具都能被找到。
      -v	打印 COMMAND 命令的描述,和 `type' 内建相似
      -V	打印每个 COMMAND 命令的详细描述
    
    退出状态
    返回 COMMAND 命令的返回状态,或者当找不到 COMMAND 命令时失败。将参数作为 shell 命令执行。
    
    将 ARGs 合成一个字符串,用结果作为 shell 的输入,
    并且执行得到的命令。
    
    退出状态:
    以命令的状态退出,或者在命令为空的情况下返回成功。当测试不同过时执行命令。
    
    `until' COMMANDS 命令的最终命令返回状态不为 0 时,
    展开并执行 COMMANDS 命令。
    
    退出状态:
    返回最后一个执行的命令的状态。只要测试成功即执行命令。
    
    只要在 `while' COMMANDS 中的最终命令返回结果为0,则
    展开并执行 COMMANDS 命令。
    
    退出状态:
    返回最后一个执行的命令的状态。根据条件执行命令。
    
    `if COMMANDS'列表被执行。如果退出状态为零,则执行`then COMMANDS' 
    列表。否则按顺序执行每个 `elif COMMANDS'列表,并且如果它的退出状态为
    零,则执行对应的 `then COMMANDS' 列表并且 if 命令终止。否则如果存在的
    情况下,执行 `else COMMANDS'列表。整个结构的退出状态是最后一个执行
    的命令的状态,或者如果没有条件测试为真的话,为零。
    
    退出状态:
    返回最后一个执行的命令的状态。基于模式匹配来执行命令。
    
    基于 PATTERN 模式匹配的词 WORD,有选择的执行 COMMANDS 命令。
    `|' 用于分隔多个模式。
    
    退出状态:
    返回最后一个执行的命令的状态。为列表中的每个成员执行命令。
    
    `for' 循环为列表中的每个成员执行一系列的命令。如果没有
    `in WORDS ...;'则假定使用 `in "$@"'。对于 WORDS 中的每
     个元素,NAME 被设定为该元素,并且执行 COMMANDS 命令。
    
    退出状态:
    返回最后执行的命令的状态。在当前 shell 中执行一个文件中的命令。
    
    在当前 shell 中读取并执行 FILENAME 文件中的命令。$PATH 变量中的
    条目被用于寻找包含 FILENAME 文件的目录。如果提供了任何的 ARGUMENTS
    参数,则它们将成为 FILENAME 文件执行时的位置参数。
    
    退出状态:
    返回 FILENAME 文件中最后一个命令的状态;如果 FILENAME 文件不可读则失败。执行条件命令。
    
    根据条件表达式 EXPRESSION 的估值返回状态0或1。表达式按照
    `test' 内建的相同条件组成,或者可以有下列操作符连接而成:
    
      ( EXPRESSION )	返回 EXPRESSION 表达式的值
      ! EXPRESSION		如果 EXPRESSION表达式为假则为真,否则为假
      EXPR1 && EXPR2	如果 EXPR1 和 EXPR2 表达式均为真则为真,否则为假
      EXPR1 || EXPR2	如果 EXPR1 和 EXPR2 表达式中有一个为真则为真,否则为假
    
    当使用 `==' 和 `!=' 操作符时,操作符右边的字符串被用作模式并且执行一个
    匹配。当使用 `=~' 操作符时,操作符右边的字符串被当作正则表达式来进行
    匹配。
    
    操作符 && 和 || 将不对 EXPR2 表达式进行估值,如果 EXPR1 表达式足够确定
    整个表达式的值。
    
    退出状态:
    根据 EXPRESSION 的值为0或1。执行 shell 内建。
    
    带参数 ARGs 执行 SHELL-BUILTIN 内建,并且不做命令查询
    在希望以 shell 函数的形式来重新实现 shell 内建,
    并且希望在函数之内执行该 shell 内建的情况下有用处。
    
    退出状态:
    以 SHELL-BUILTIN 内建的退出状态为准,或者如果 SHELL-BUILTIN不是一个 shell 内建时
    为假。.退出 %d退出一个登录 shell.
    
    以状态 N 退出一个登录 shell。如果不在登录 shell 中执行,则
    返回一个错误。退出 for、while 或 until 循环
    
    退出一个 FOR、WHILE 或 UNTIL 循环。如果指定了N,则跳出N重
    循环
    
    退出状态:
    退出状态为0除非 N 不大于或等于 1。退出shell。
    
    以状态 N 退出 shell。  如果 N 被省略,则退出状态
    为最后一个执行的命令的退出状态。文件限制浮点数异常在 FORMAT 的控制下格式化并打印 ARGUMENTS 参数。
    
    选项:
      -v var	将输出赋值给 shell 变量 VAR 而不显示在标准输出上
    
    FORMAT 是包含三种对象的字符串:简单地被拷贝到标准输出的普通字符;
    被变换之后拷贝到标准输入的转义字符;以及每个都会影响到下个参数的打印的格式化声明。
    
    在 printf(1) 中描述的标准控制声明之外,printf 解析:
    
      %b	扩展对应参数中的反斜杠转义序列
      %q	以可作为 shell 输入的格式引用参数
      %(fmt)T	以 FMT 为供给 strftime(3) 的格式输出日期时间字符串
    
    退出状态:
    返回成功,除非使用了无效的选项或者写或赋值错误发生。GNU bash,版本 %s (%s)
GNU bash,版本 %s-(%s)
GNU 长选项:
使用 GNU 软件的通用帮助:<http://www.gnu.org/gethelp/>
将命令组合为一个单元。
    
    运行组中的命令集合。这是对整个命令集合
    做重定向的方法之一。
    
    退出状态:
    返回最后一个执行的命令的状态。HFT 待输入数据已授予 HFT 监视模式已撤销 HFT 监视模式已完成 HFT 声音序列HOME 未设定挂断没有名字!I/O 就绪非法的指令信息请求中断已杀死许可证 GPLv3+: GNU GPL 许可证第三版或者更新版本 <http://gnu.org/licenses/gpl.html>
标记 shell 变量为不可改变。
    
    标记每一个 NAME 名称为只读;这些 NAME 变量的值将不可以被后续的赋值
    操作所改变。如果提供了 VALUE,则在标记为只读之前将 VALUE 值赋给变量。
    
    选项:
      -a	指下标数组变量
      -A	指关联数组标量
      -f	指 shell 函数
      -p	显示只读变量或函数列表,取决于是否提供了 -f 选项
    
    `--' 的参数禁用进一步的选项处理。
    
    退出状态:
    返回成功,除非使用了无效的选项或者 NAME 名称。修改或显示补全选项。
    
    修改每个 NAME 名称的补全选项,或如果没有提供 NAME 名称,执行当前的补全。
    如果不带选项,打印每个 NAME 名称的补全选项或当前的补全声明。
    
    选项:
    	-o option	为每个 NAME 名称设定补全选项 option
    	-D		为 "default" 命令补全改变选项
    	-E		为 "empty" 命令补全改变选项
    
    使用 `+o' 而不是 `-o' 可以关闭指定的选项。
    
    参数:
    
    每个 NAME 名称都对应一个之前以通过 `complete' 内建定义了的补全声明的
    命令。如果不提供 NAME 名称,当前生成补全的函数必须调用 compopt,
    并且当前执行的补全生成器选项会被修改。
    
    退出状态:
    返回成功,除非使用了无效的选项或者 NAME 名称没有定义补全声明。修改 shell 资源限制。
    
    在允许此类控制的系统上,提供对于 shell 及其创建的进程所可用的
    资源的控制。
    
    选项:
      -S	使用软 (`soft') 资源限制
      -H	使用硬 (`hard') 资源限制
      -a	所有当前限制都被报告
      -b	套接字缓存尺寸
      -c	创建的核文件的最大尺寸
      -d	一个进程的数据区的最大尺寸
      -e	最高的调度优先级 (`nice')
      -f	有 shell 及其子进程可以写的最大文件尺寸
      -i	最多的可以挂起的信号数
      -k	分配给此进程的最大 kqueue 数量
      -l	一个进程可以锁定的最大内存尺寸
      -m	最大的内存进驻尺寸
      -n	最多的打开的文件描述符个数
      -p	管道缓冲区尺寸
      -q	POSIX 信息队列的最大字节数
      -r	实时调度的最大优先级
      -s	最大栈尺寸
      -t	最大的CPU时间,以秒为单位
      -u	最大用户进程数
      -v	虚拟内存尺寸
      -x	最大的文件锁数量
      -P	最大伪终端数量
      -T	最大线程数量
    
    并非所有选项在所有系统上可用。
    
    如果提供了 LIMIT 变量,则它为指定资源的新的值;特别的 LIMIT 值为
    `soft'、`hard'和`unlimited',分别表示当前的软限制,硬限制和无限制。
    否则打印指定资源的当前限制值,不带选项则假定为 -f
    
    取值都是 1024 字节为单位,除了 -t 以秒为单位,-p 以 512 字节递增,
    -u 为无范围的进程数量。
    
    退出状态:
    返回成功,除非使用了无效的选项或者错误发生。将任务移至前台。
    
    将以 JOB_SPEC 标识的任务放至前台,使其成为
    当前任务。如果 JOB_SPEC 不存在,shell 观念中的当前任务 
    将被使用。
    
    退出状态:
    放至前台的命令状态,或者当错误发生时为失败。移动任务至后台。
    
    将 JOB_SPEC 标识的任务放至后台,就像它们
    是带 `&' 启动的一样。如果 JOB_SPEC 不存在,shell 观念中的
    当前任务将会被使用。
    
    退出状态:
    返回成功除非任务管理没有启用或者错误发生。空的命令。
    
    没有效果; 此命令不做任何操作。
    
    退出状态:
    总是成功。OLDPWD 未设定解析选项参数。
    
    Getopts 被 shell 过程用于解析可定位的参数作为选项。
    
    
    OPTSTRING 字符串包含待识别的选项字母;如果一个字母后面跟
    着分号,则该选项需要一个参数,而该参数应用空格与选项分开。
    
    
    每次启动时,getopts 会将下一个选项放到 shell 变量 $name
    中,如果 name 变量不存在则先将其初始化,而下一个待处
    理的参数序号放入 shell 变量 OPTIND 中。OPTIND 变量在每
    次 shell 或者 shell 脚本启动时都被初始化为1。当一个选项要
    求有一个参数时,getopts 将参数放入 shell 变量 OPTARG
    中。
    
    getopts 有两种报告错误的方法。如果 OPTSTRING 变量的第
    一个字符是冒号,getopts 使用沉默错误报告。在这种模式
    下,不会打印错误消息。如果看到了一个无效的选项,
    getopts 将找到的选项字符放至 OPTARG 变量中。如果一个必
    须的选项没有找到,getopts 放一个 ':' 到 NAME 变量中并且设
    置 OPTARG 变量为找到的选项字符。如果 getopts 不在沉默模
    式中,并且遇到了一个无效的选项,getopts 放置一个 '?' 到 NAME 
    变量中并且取消设定 OPTARG变量。如果必须的选项没有找到,
    一个'?'会被放入 NAME变量中,OPTARG 将被取消设定,并且会
    打印一个诊断信息。
    
    如果 shell 变量 OPTERR 的值为0,getopts 禁用
    错误信息的打印,即使 OPTSTRING 变量的第一个字符不是一
    个冒号。OPTERR 的默认值为1.
    
    Getopts 通常解析可定位的参数($0 - $9),不过如果提供了
    更多的参数,它们反而会被解析。
    
    退出状态:
    如果一个选项被找到则返回成功;如果遇到了选项的结尾或者
    有错误发生则返回失败。打印当前工作目录的名字。
    
    选项:
      -L	打印 $PWD 变量的值,如果它包含了当前的工作目录
      -P	打印当前的物理路径,不带有任何的符号链接
    
    默认情况下,`pwd' 的行为和带 `-L' 选项一致
    
    退出状态:
    除非使用了无效选项或者当前目录不可读,否则返回状态为0。退出从标准输入读取一行并将其分为不同的域。
    
    从标准输入读取单独的一行,或者如果使用了 -u 选项,从文件描述符 FD 中读取。
    该行被分割成域,如同词语分割一样,并且第一个词被赋值给第一个 NAME 变量,第二
    个词被赋值给第二个 NAME 变量,如此继续,直到剩下所有的词被赋值给最后一个 NAME
    变量。只有 $IFS 变量中的字符被认作是词语分隔符。
    
    如果没有提供 NAME 变量,则读取的行被存放在 REPLY 变量中。
    
    选项:
      -a array	将词语赋值给 ARRAY 数组变量的序列下标成员,从零开始。
      -d delim	持续读取直到读入 DELIM 变量中的第一个字符,而不是换行符
      -e	在一个交互式 shell 中使用 Readline 获取行
      -i text	使用 TEXT 文本作为 Readline 的初始文字
      -n nchars	读取 nchars 个字符之后返回,而不是等到读取换行符。
    		但是分隔符仍然有效,如果遇到分隔符之前读取了不足 nchars 个字符。
      -N nchars	在准确读取了 nchars 个字符之后返回,除非遇到文件结束符或者读超时,
    		任何的分隔符都被忽略
      -p prompt	在尝试读取之前输出 PROMPT 提示符并且不带
    		换行符
      -r	不允许反斜杠转义任何字符
      -s	不显示终端的任何输入
      -t timeout	如果在 TIMEOUT 秒内没有读取一个完整的行则超时并且返回失败。
    		TMOUT 变量的值是默认的超时时间。
    		TIMEOUT 可以是小数。如果 TIMEOUT 是 0,那么仅当在指定的文件描述符上
    		输入有效的时候,read 才返回成功。
    		如果超过了超时时间,则返回状态码大于 128
      -u fd	从文件描述符 FD 中读取,而不是标准输入
    
    退出状态:
    返回码为零,除非遇到了文件结束符,读超时,或者无效的文
    件描述符作为参数传递给了 -u 选项。从一个文件中读取行到数组变量中
    
    一个 `mapfile'的同义词。从标准输入读取行到下标数组变量中。
    
    从标准输入读取行到下标数组变量 ARRAY 中,或者如果使用了 -u 选项,
    从文件描述符 FD 中读取。MAPFILE 变量是默认的 ARRAY 变量。
    
    选项:
      -d delim	使用 DELIM 而非换行符断行
      -n count	最多拷贝 COUNT 行,如果 COUNT 为 0,则拷贝所有行。
      -O origin	从下标 ORIGIN 开始 赋值给 ARRAY 变量。默认下标是0.
      -s count 	丢弃最先读取的 COUNT 行。
      -t		从读取的每行末尾删除一个换行符。
      -u fd		从文件描述符 FD 中读取行而不是标准输入。
      -C callback	每 QUANTUM 次读行之后对 CALLBACK 回调进行估值。
      -c quantum	定义每次调用 CALLBACK 回调之间读取的行数。
    
    参数:
      ARRAY		存储数据使用的数组变量
    
    如果使用了 -C 而没有 -c,默认的量子是5000。当对 CALLBACK 估值时,
    下一个将被赋值的数组元素的下标作为额外参数被传递。
    
    如果没有显式指定起始下标,mapfile 将在赋值前清空 ARRAY 变量。
    
    退出状态:
    返回成功,除非使用了无效的选项,或者 ARRAY 变量只读或不是下标数组。记录锁记住或显示程序位置。
    
    确定并记住每一个给定 NAME 名称的命令的完整路径。
    如果不提供参数,则显示已经记住的命令的信息。
    
    选项:
      -d		忘记每一个已经记住的 NAME 的位置
      -l		以可作为输入重用的格式显示
      -p pathname	使用 pathname 路径作为 NAME 命令的全路径
      -r		忘记所有记住的位置
      -t		打印记住的每一个 NAME 名称的位置,如果指定了多个
    		NAME 名称,则每个位置前面会加上相应的 NAME 名称
    		
    参数:
      NAME		每个 NAME 名称会在 $PATH 路径变量中被搜索,并且添加到记住的命令
    列表中。
    
    退出状态:
    返回成功,除非 NAME 命令没有找到或者使用了无效的选项。从栈中删除目录。
    
    从目录栈中删除条目。不带参数时,删除栈顶目录,并改变至新的栈
    顶目录。
    
    选项:
      -n	抑制从栈中删除目录时通常的目录变换操作,从而仅对栈
    	进行操作。
    
    参数:
      +N	删除第 N 个目录 (`dirs' 显示的目录列表中左起,从零开始)。
    	例如: `popd +0' 删除第一个目录,`popd +1' 删除第二个。
    
      -N	删除第 N 个目录 (`dirs' 显示的目录列表中右起,从零开始)。
    	例如: `popd -0' 删除最后一个目录,,`popd -1' 删除倒数第二个。
    
    `dirs' 内建显示目录栈。
    
    退出状态:
    返回成功,除非使用了无效的参数或者目录变换失败。从别名定义列表中删除每一个“名字”。
    
    选项:
      -a	删除所有的别名定义。
    
    返回成功,除非“名字“不是一个已存在的别名。从当前 shell 中删除任务。
    
    从活动任务表中删除每一个 JOBSPEC 参数。不带任何
    JOBSPEC 参数时,shell 使用观念中的当前任务。
    
    选项:
      -a	如果不提供 JOBSPEC 参数,则删除所有任务
      -h	标识每个 JOBSPEC 任务,从而当 shell 接收到 SIGHUP
    		信号时不发送 SIGHUP 给指定任务
      -r	仅删除运行中的任务
    
    退出状态:
    返回成功除非使用了无效的选项或者 JOBSPEC 声明。从目录栈中删除条目。不带参数时,删除
    栈顶目录并改变至新的栈顶目录。
    
    选项:
      -n	抑制从栈中删除目录时通常的改变目录操作,
    	从而只有栈被操作。
    
    参数:
      +N	从 `dirs' 输出的列表中,
    	删除左起第N个条目,计数从0开始。例如:`popd +0'
    	删除第一个目录,`popd +1' 删除第二个。
    
      -N	从 `dirs' 输出的列表中,
    	删除右起第N个条目,计数从0开始,例如:`popd -0'
    	删除最后一个条目,`popd -1' 删除倒数第二个。
    
    `dirs' 内建变量显示目录栈。使用指定命令替换 shell。
    
    执行 COMMAND 命令,以指定的程序替换这个 shell。
    ARGUMENTS 参数成为 COMMAND命令的参数。如果
    没有指定COMMAND 命令,则任何的重定向在当前 shell 中生效。
    
    选项:
      -a 名称	作为第0个参数传递给 COMMAND 命令
      -c		在一个空环境中执行 COMMAND 命令
      -l		在COMMAND 命令的第0个参数中加一个短线
    
    如果命令不能被执行,则退出一个非交互式的 shell,除非
   shell 选项`execfail' 已经设定。
    
    退出状态:
    返回成功除非 COMMAND 命令没有找到或者出现一个重定向错误。报告管道执行的消耗时间。
    
    执行 PIPELINE 并且打印 PIPELINE 终结时实际时间、用户 CPU 时间和系统
    CPU 时间的总结。
    
    选项:
      -p	用可迁移的 POSIX 格式打印用时总结。
    
    TIMEFORMAT 变量的值被作为输出格式。
    
    退出状态:
    返回状态即PIPELINE 的返回状态。继续 for、while 或 until 循环。
    
    继续当前 FOR、WHILE 或 UNTIL 循环的下一步。
    如果指定了 N, 则继续当前的第 N 重循环。
    
    退出状态:
    退出状态为 0 除非 N 不大于或等于1。在前台继续任务
    
    对于 JOB_SPEC 参数来说和 `fg' 命令等同。继续一个
    停止的或者后台任务。JOB_SPEC 可以指定一个任务
    名字或任务号。在 JOB_SPEC 后加上一个 `&' 将会把
    任务放至后台,就像任务声明被作为 `bg' 命令的参数
    执行一样。
    
    退出状态:
    返回被继续的任务的状态。返回一个成功结果。
    
    退出状态:
    总是成功返回一个不成功的结果。
    
    退出状态:
    总是失败。从一个 shell 函数返回。
    
    使一个函数或者被引用的脚本以指定的返回值 N 退出。
    如果 N 被省略,则返回状态就是
    函数或脚本中的最后一个执行的命令的状态。
    
    退出状态:
    返回 N,或者如果 shell 不在执行一个函数或引用脚本时,失败。返回当前子调用的上下文。
    
    不带有 EXPR 时,返回 "$line $filename"。带有 EXPR 时,返回
    "$line $subroutine $filename";这个额外的信息可以被用于提供
    栈追踪。
    
    EXPR 的值 显示了到当前调用帧需要回去多少个调用帧;顶部帧
    是第 0 帧。
    
    退出状态:
    除非 shell 不在执行一个 shell 函数或者 EXPR 无效,否则返回结
    果为0。返回当前子例程调用的上下文
    
    不带 EXPR 时,返回运行中段错误从列表中选取词并且执行命令。
    
    WORDS 变量被展开,生成一个词的列表。展开的词集合被打印
    在标准错误输出设备上,每个以一个数字做前缀。如果没有 `in WORDS'
    则假定使用`in "$@"'。PS3提示符会被显示并且从标准输入读入一行
    如果该行由被显示的词对应的数字组成,则 NAME 变量被设定为相应
    的词。如果行为空,则 WORDS 变量和提示符被重新显示。如果读取了
    文件结束符,则命令完成。读入任何其他的值会导致 NAME 变量被设定
    为空。读入的行被存放在变量 REPLY 中。COMMANDS 命令在每次选择
    之后执行直到执行一个 break 命令。
    
    退出状态:
    返回最后一个执行的命令的状态。设定 Readline 键绑定和变量。
    
    绑定一个键序列到一个 Readline 函数或者宏,或者设定一个
    Readline 变量。非选项参数的语法和 ~/.inputrc 文件中的等
    同,但是必须作为一个参数被传递,
    例如,bind '"\C-x\C-r": re-read-init-file'.
    
    选项:
      -m  键映射      在此命令执行过程中使用指定的键映射。
                     可被接受的键映射名字有 emacs、emacs-standard、emacs-meta、
                     emacs-ctlx、vi、vi-move、vi-command、和 vi-insert。
      -l             列出函数名称。
      -P             列出函数名称和绑定。
      -p             以可以重新用作输入的格式列出函数名称和绑定。
      -S             列出可以启动宏的键序列以及它们的值
      -s             以可以重新用作输入的格式列出可以启动宏的键以及它们的值。
      -V             列出变量名成和它们的值
      -v             以可以重新用作输入的格式列出变量的名称和它们的值
      -q  函数名      查询指定的函数可以由哪些键启动。
      -u  函数名      反绑定所有绑定至指定函数的键。
      -r  键序列      取消指定键序列的绑定。
      -f  文件名      从指定文件中读取键绑定。
      -x  键序列:shell命令	当指定的键序列被输入时,执行指定的 shell 命令。
      -X             以可被重用的形式列出用 -x 绑定的键序列和命令。
    
    退出状态:
    除非使用了无法辨认的选项或者错误发生,否则返回0.设定和取消设定 shell 选项。
    
    改变每个 shell 选项 OPTNAME的设定。不带参数
    时,列出所有 shell 选项并标注每一个选项是否被
    设定。
    
    选项:
      -o	限制 OPTNAME 为定义用于`set -o' 的选项
      -p	打印每个 shell 选项并标注它的状态。
      -q	抑制输出
      -s	启用(设定)每个 OPTNAME 选项
      -u	禁用(取消设定)每个 OPTNAME 选项
    
    退出状态:
    如果 OPTNAME 选项被启用则返回成功;如果是
    无效的选项或OPTNAME 被禁用则失败。为 shell 变量设定导出属性。
    
    标记每个 NAME 名称为自动导出到后续命令执行的环境。如果提供了 VALUE
    则导出前将 VALUE 作为赋值。
    
    选项:
      -f	指 shell 函数
      -n	删除每个 NAME 名称的导出属性
      -p	显示所有导出的变量和函数的列表
    
    `--' 的参数禁用进一步的选项处理。
    
    退出状态:
    返回成功,除非使用了无效的选项或者 NAME 名称。设定变量值和属性。
    
    声明变量并且赋予它们属性。如果没用给定名称,
    则显示所有变量的属性和值。
    
    选项:
      -f	限制动作或显示为只函数名称和定义
      -F	限制仅显示函数名称 (以及行号和源文件名,当调试时)
      -g	当用于 shell 函数内时创建全局变量; 否则忽略
      -p	显示每个 NAME 变量的属性和值
    
    设定属性的选项:
      -a	使 NAME 成为下标数组 (如果支持)
      -A	使 NAME 成为关联数组 (如果支持)
      -i	使 NAME 带有 `integer' (整数)属性
      -l	将 NAME 在赋值时转为小写
      -n	使 NAME 成为指向一个以其值为名称的变量的引用
      -r	将 NAME 变为只读
      -t	使 NAME 带有 `trace' (追踪)属性
      -u	将 NAME 在赋值时转为大写
      -x	将 NAME 导出
    
    用 `+' 代替 `-' 会关闭指定选项。
    
    带有整数属性的变量在赋值时将使用算术估值(见
    `let' 命令)
    
    在函数中使用时,`declare' 使 NAME 成为本地变量,和 `local'
    命令一致。`-g' 选项抑制此行为。
    
    退出状态:
    返回成功除非使用了无效选项或者发生错误。Shell 命令匹配关键字 `Shell 选项:
移位位置参数。
    
    重命名位置参数 $N+1、$N+2 ... 到 $1、$2 ...  如果没有给定 N,
    则假设为1.
    
    退出状态:
    返回成功,除非 N 为负或者大于 $#。信号 %d声明 readline 如何完成读取参数。
    
    声明对于每一个 NAME 名称如何完成读取参数。如果不带选项,
    现有的补全声明会以可以重用为输入的格式打印出来。
    
    选项:
      -p	以可重用的格式打印现有的补全声明。
      -r	对于每个 NAME 名称删除补全声明,或者如果没有提供 NAME
    	名称,删除所有的补全声明。
      -D	对于没有补全声明定义的命令,设定默认的补全动作
      -E	对于 "empty" 命令设定补全动作,—— 对于空行的补全。
    
    尝试补全时,按照上述大写字母选项的顺序进行动作。-D 选项优先
    级高于 -E 选项。
    
    退出状态:
    返回成功,除非使用了无效的选项或者错误发生。已停止已停止(信号)已停止(tty 输入)已停止(tty 输出)已停止(%s)挂起 shell 执行。
    
    挂起 shell 的执行直到收到 SIGCONT 信号。
    登录 shell 不可以被挂起,除非强制执行。
    
    选项:
      -f	强制挂起,即使是登录 shell。
    
    退出状态:
    返回成功,除非没有启用任务控制或者有错误发生。时间格式: `%c': 无效的格式字符已终止%s 中的邮件已被阅读
有运行中的任务。
有停止的任务。
在法律许可的情况下特此明示,本软件不提供任何担保。这些 shell 命令是内部定义的。请输入 `help' 以获取一个列表。
输入 `help 名称' 以得到有关函数`名称'的更多信息。
使用 `info bash' 来获得关于 shell 的更多一般性信息。
使用 `man -k' 或 `info' 来获取不在列表中的命令的更多信息。

名称旁边的星号(*)表示该命令被禁用。

本软件是自由软件,您可以自由地更改和重新发布。对信号和其他事件设陷阱。
    
    定义一个处理器,在 shell 接收到信号和其他条件下执行。
    
    ARG 参数是当 shell 接收到 SIGNAL_SPEC 信号时读取和执行的命令。
    如果没有指定 ARG 参数 (并且只给出一个 SIGNAL_SPEC 信号) 或者
 ARG 参数为
    `-',每一个指定的参数会被重置为原始值。如果 ARG 参数是一个空串,则每一个
    SIGNAL_SPEC 信号会被 shell 和它启动的命令忽略。
    
    如果一个 SIGNAL_SPEC 信号是 EXIT (0) ,则 ARG 命令会在 shell 退出时被
    执行。如果一个 SIGNAL_SPEC 信号是 DEBUG,则 ARG命令会在每一个简单命
    令之前执行。
    
    如果不提供参数,trap 打印列表显示每一个与每一个信号相关联的命令。
    
    选项:
      -l	打印一个信号名称和它们对应的编号的列表
      -p	打印与每个 SIGNAL_SPEC 信号相关联的陷阱命令
    
    每一个 SIGNAL_SPEC 信号可以是 <signal.h> 中的信号名称或者信号编号。
    信号名称大小写敏感且可以使用 SIG 前缀。信号可用 "kill -信号 $$"
    发送给 shell。
    
    退出状态:
    返回成功,除非使用了无效的选项或者 SIGSPEC。请输入`%s -c "help set"' 以获得关于 shell 选项的更多信息
请输入 `%s -c help' 以获得关于 shell 内建命令的更多信息.
未知信号 #未知信号 #%d未知错误未知状态取消设定 shell 变量和函数的值和属性。
    
    对每一个 NAME 名称,删除对应的变量或函数。
    
    选项:
      -f	将每个 NAME 视为函数
      -v	将每个 NAME 视为变量
      -n	将每个 NAME 视为名称引用,只取消其本身而非其指向的变量
    
    不带选项时,unset 首先尝试取消设定一个变量,如果失败,再尝试取消设定一个函数。
    
    某些变量不可以被取消设定;参见 `readonly'。
    
    退出状态:
    返回成功,除非使用了无效的选项或者 NAME 名称为只读。紧急 I/O 状况用法:	%s [GNU 长选项] [选项] ...
	%s [GNU 长选项] [选项] 脚本文件 ...
使用 "%s" 退出 shell 。
请使用`bashbug' 命令来报告错误.
用户信号1用户信号2等待任务完成并返回退出状态。
    
    等待以 ID 编号识别的进程,其中ID 可以是进程编号或者任务声明,
    并报告它的终止状态。如果 ID 没有给出,则等待所有的当前活跃子
    进程,并且返回状态为零。如果 ID 是任务声明,等待任务管道中的
    所有进程。
    
    若给定了 -n 选项,等待下一个任务完成并返回其状态。
    
    退出状态:
    返回最后一个 ID 进程的状态;如果使用了无效的 ID 或者选项则失败。等待进程完成并且返回退出状态。
    
    等待指定进程并报告它的终止状态。如果没有提供 PID,则当前所有的活跃
    子进程都会被等待,并且返回码为零。PID 必须为进程号。
    
    退出状态:
    返回进程 ID 的状态;如果 PID 是无效的进程号或者指定了无效的选项则失败。窗口已改变写参数至标准输出设备。
    
    在标准输出设备上显示 ARGs 参数和一个换行。
    
    选项:
      -n	不附加换行
    
    退出状态:
    除非写错误发生,否则返回成功。将参数写到标准输出。
    
    在标准输出上,显示用空格分割的 ARG 参数后跟一个换行。
    
    选项:
      -n	不要追加换行
      -e	启用下列反斜杠转义的解释
      -E	显式地抑制对于反斜杠转义的解释
    
    `echo' 对下列反斜杠字符进行转义:
      \a	警告(响铃)
      \b	退格
      \c	抑制更多的输出
      \e	转义字符
      \f	换页字符
      \n	换行
      \r	回车
      \t	横向制表符
      \v	纵向制表符
      \\	反斜杠
      \0nnn	以 NNN (八进制)为 ASCII 码的字符。 NNN 可以是 0 到 3 个八进制位
      \xHH	以 HH (十六进制)为值的八按位字符。HH可以是一个或两个十六进制位
    
    退出状态:
    返回成功除非有写错误发生。您在 $_ 中有邮件您在 $_ 中有新邮件[ 参数... ][[ 表达式 ]]`%c': 命令错误`%c': 无效格式字符`%c': 无效的符号状态字符`%c': 无效的符号状态运算符`%c': 无效的时间格式声明`%s': 无法解除绑定`%s': 无效的别名`%s': 无效的键映射名`%s': 特殊内建`%s': 缺少格式字符`%s': 不是有效的进程号或者任务声明`%s': 不是有效的标识符`%s': 未知函数名需要 `)'需要`)',得到 %s条件表达式需要 `:'add_process: 进程号 %5ld(%s) 标注为仍活着add_process: 进程 %5ld(%s) 进入 the_pipelinealias [-p] [名称[=值] ... ]all_local_variables: 当前作用域中没有函数上下文参数需要参数需要数组变量支持尝试给非变量赋值数组下标不正确错误的命令类型错误的条件连接符错误的跳转错误的替换: 在 %s 中没有闭合的 "`"错误的替换: 在 %2$s 中没有闭合的 `%1$s'bash 首页:<http://www.gnu.org/software/bash>
bash_execute_unix_command: 无法为命令找到键映射bg [任务声明 ...]bind [-lpvsPSVX] [-m 键映射] [-f 文件名] [-q 名称] [-u 名称] [-r 键序列] [-x 键序列:shell-命令] [键序列:readline-函数 或 readline-命令]大括号展开: 无法为 %s 分配内存大括号展开: 为 %d 个元素分配内存失败大括号展开: 为 `%s' 分配内存失败break [n]错误:表达式赋值符号错误builtin [shell 内建 [参数 ...]]caller [表达式]只能从函数或者源脚本返回(`return')只能在函数中使用无法从文件描述符 %d 为 bash 的输入获取一个新的文件描述符无法为立即文档创建临时文件: %s无法复制文件描述符 %d 到文件描述符 %d无法将命名管道 %s 作为文件描述符 %d 复制无法在共享对象 %2$s 中找到 %1$s: %3$s无法为命令替换创建子进程无法为进程替换创建子进程无法为命令替换创建管道无法为进程替换创建管道无法打开命名管道 %s 进readline-无法打开命名管道 %s 进行写入无法打开共享对象 %s: %s无法从 /dev/null 重定向标准输入: %s无法为文件描述符 %d 重置nodelay模式无法同时设定和取消设定 shell 选项无法将 gid 设为 %d: 有效 gid %d无法设定终端进程组(%d)无法将 uid 设为 %d: 有效 uid %d无法同时取消设定一个函数和一个变量无法挂起无法挂起一个登录 shell无法用 `-f' 生成函数最多只能使用 -anrw 选项中的一个case 词 in [模式 [| 模式]...) 命令 ;;]... esaccd [-L|[-P [-e]] [-@]] [目录]子进程 setpgid (%ld 到 %ld)command [-pVv] 命令 [参数 ...]command_substitute: 无法将管道复制为文件描述符 1compgen [-abcdefgjksuv] [-o 选项]  [-A 动作] [-G 全局模式] [-W 词语列表]  [-F 函数] [-C 命令] [-X 过滤模式] [-P 前缀] [-S 后缀] [词语]complete [-abcdefgjksuv] [-pr] [-DE] [-o 选项] [-A 动作] [-G 全局模式] [-W 词语列表]  [-F 函数] [-C 命令] [-X 过滤模式] [-P 前缀] [-S 后缀] [名称 ...]补全: 未找到函数 `%s'compopt [-o|+o 选项] [-DE] [名称 ...]需要二元条件运算符continue [n]coproc [名称] 命令 [重定向]无法找到 /tmp ,请创建cprintf: `%c': 无效的格式字符当前declare [-aAfFgilnrtux] [-p] [名称[=值] ...]删除进程组 %2$ld 中已停止的任务 %1$ddescribe_pid: %ld: 无此进程号目录栈为空目录栈索引dirs [-clpv] [+N] [-N]除以 0动态加载不可用echo [-n] [参数 ...]echo [-neE] [参数 ...]空数组变量名enable [-a] [-dnps] [-f 文件名] [名称 ...]获取终端属性时出错: %s`%s' 函数定义导入错误设定终端属性时出错: %seval [参数 ...]eval: 超出最大 eval 嵌套层数 (%d)exec [-cl] [-a 名称] [命令 [参数 ...]] [重定向 ...]exit [n]需要 `)'指数小于 0export [-fn] [名称[=值] ...] 或 export -p需要表达式表达式递归层次越界fc [-e 编辑器名] [-lnr] [起始] [终结] 或 fc -s [模式=替换串] [命令]fg [任务声明]文件描述符超出范围需要文件名参数for (( 表达式1; 表达式2; 表达式3 )); do 命令; donefor 名称 [in 词语 ... ] ; do 命令; done叉分 (fork) 出的的进程号 %d 出现在运行中的任务 %d 中格式解析问题: %sfree: 用已经释放的块作为参数被调用free: 用未分配的块作为参数被调用free: 其实和末尾块大小不一致free: 检测到下溢;mh_nbytes 越界function 名称 { 命令 ; } 或 name () { 命令 ; }未来版本的 shell 会强制估值为算术替换getcwd: 无法访问父目录getopts 选项字符串 名称 [参数]hash [-lr] [-p 路径名] [-dt] [名称 ...]已禁用哈希help [-dms] [模式 ...]此版本内帮助不可用立即文档在第 %d 行被文件结束符分隔 (需要 `%s')history [-c] [-d 偏移量] [n] 或 history -anrw [文件名] 或 history -ps 参数 [参数...]历史位置历史声明命中	命令
预增符或预减符后应跟有标识符if 命令; then 命令; [ elif 命令; then 命令; ]... [ else 命令; ] fiinitialize_job_control: getpgrp 失败initialize_job_control: 行规则initialize_job_control: setpgid无效的算术进制无效的基%2$s 的 exportstr 中有无效的字符 %1$d无效的十六进制数无效数字无效的八进制数无效的信号数在不带任务控制的情况下启动了任务 %djob_spec [&]jobs [-lnprs] [任务声明 ...] 或 jobs -x 命令 [参数]kill [-s 信号声明 | -n 信号编号 | -信号声明] 进程号 | 任务声明 ... 或 kill -l [信号声明]上一个命令: %s
let 参数 [参数 ...]limit第 %d 行:未启用行编辑为 %s 载入函数失败 (%d): 未载入local [option] 名称[=值] ...注销
logout [n]循环计数make_here_document: 错误的指令类型 %dmake_local_variable: 当前作用域中没有函数上下文make_redirection: 重定向指令 `%d' 越界malloc: 空闲链表中的块损坏malloc: 断言失败: %s
mapfile [-d 分隔符] [-n 计数] [-O 起始序号] [-s 计数] [-t] [-u fd] [-C 回调] [-c 量子] [数组]超出最大立即文档数量迁移进程至另一个 CPU缺少 `)'缺少 `]'使用了 \x 但缺少十六进制位使用了 \%c 但缺少 unicode 数不支持网络操作%s 的 exportstr 中没有 `='%2$s 中没有闭合的 `%1$c'未找到命令没有与 `%s' 匹配的帮助主题。尝试 `help help' 或 `man -k %s' 或 `info %s'。无任务控制此 shell 中无任务控制无匹配: %s无其他目录其他选项不能与 `-x' 同时使用当前未执行补全功能不是登录 shell: 使用 `exit'八进制数仅在 `for', `while', 或者`until' 循环中有意义管道错误pop_scope: shell_variables 的头部不是临时环境作用域pop_var_context: shell_variables 的头部不是函数上下文pop_var_context: 没有 global_variables 上下文popd [-n] [+N | -N]即将停电print_command: 错误的条件连接符 `%d'printf [-v var] 格式 [参数]progcomp_insert: %s: 空的补全声明编程错误pushd [-n] [+N | -N | 目录]pwd [-LP]read [-ers] [-a 数组] [-d 分隔符] [-i 缓冲区文字] [-n 读取字符数] [-N 读取字符数] [-p 提示符] [-t 超时] [-u 文件描述符] [名称 ...]读错误: %d: %sreadarray [-n 计数] [-O 起始序号] [-s 计数] [-t] [-u fd] [-C 回调] [-c 量子] [数组]readonly [-aAf] [名称[=值] ...] 或 readonly -prealloc: 用未分配的块作为参数被调用realloc: 其实和末尾块大小不一致realloc: 检测到下溢;mh_nbytes 越界递归栈下溢重定向错误: 无法复制文件描述符register_alloc: %p 在表中显示为已分配?
register_alloc: 分配表已经充满了 FIND_ALLOC?
register_free: %p 在表中显示为已释放?
受限的return [n]run_pending_traps: trap_list[%d] 中的错误值: %prun_pending_traps: 信号处理器是 SIG_DFL,重新发送 %d (%s) 给自己save_bash_input: 已经存在新的文件描述符 %d 的缓冲区select NAME [in 词语 ... ;] do 命令; doneset [--abefhkmnptuvxBCHP] [-o 选项名] [--] [参数 ...]setlocale: %s: 无法改变区域选项 (%s)setlocale: %s: 无法改变区域选项 (%s): %ssetlocale: LC_ALL: 无法改变区域选项 (%s)setlocale: LC_ALL: 无法改变区域选项 (%s): %sshell 层次 (%d) 太高,重置为 1shift [n]位移计数shopt [-pqsu] [-o] [选项名 ...]sigprocmask: %d: 无效的操作source 文件名 [参数]start_pipeline: 进程组管道suspend [-f]语法错误条件表达式中有语法错误条件表达式中有语法错误: 未预期的符号 `%s'表达式中有语法错误`%s' 附近有语法错误未预期的符号 `%s' 附近有语法错误语法错误: `((%s))'语法错误: 需要 `;'语法错误: 需要算术表达式语法错误: 无效的算术运算符语法错误: 需要操作数语法错误: 未预期的文件结尾系统即将崩溃test [表达式]time [-p] 管道参数太多trap [-lp] [[参数] 信号声明 ...]trap_handler: 错误的信号 %dtype [-afptP] 名称 [名称 ...]typeset [-aAfFgilnrtux] [-p] 名称[=值] ...ulimit [-SHabcdefiklmnpqrstuvxPT] [限制]umask [-p] [-S] [模式]unalias [-a] 名称 [名称 ...]寻找 `]]' 是遇到了未预期的文件结束符寻找匹配的 `%c' 是遇到了未预期的文件结束符寻找匹配的 `)' 时遇到了未预期的文件结束符二元条件运算符使用了未预期的参数 `%s'一元条件运算符使用了未预期的参数 `%s'二元条件运算符使用了未预期的参数一元条件运算符使用了未预期的参数条件命令中有未预期的符号 %d条件命令中有未预期的符号 `%c'条件命令中有未预期的符号 `%s'未预期的符号 `%s',需要二元条件运算符未预期的符号 `%s' ,需要 `)'未知未知的命令错误unset [-f] [-v] [-n] [名称 ...]until 命令; do 命令; done数值太大不可为算术进制的基variables - 一些 shell 变量的名称和含义wait [-n] [编号 ...]wait [进程号 ...]wait: 进程号 %ld 不是当前 shell 的子进程wiat_for: 没有进程 %ld 的记录wait_for_job: 任务 %d 已停止waitchld: 打开 WNOHANG 以避免无限阻塞警告:警告: %s: %s警告: -C 选项可能不像您预期的那样工作警告: -F 选项可能不像您预期的那样工作while 命令; do 命令; done写错误: %sxtrace fd (%d) != fileno xtrace fp (%d)xtrace_set: %d: 无效的文件描述符xtrace_set: 空的文件指针{ 命令 ; }

Zerion Mini Shell 1.0