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484.

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[tab]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.

485.

Remove each NAME from the list of defined aliases.

Options:
-a[tab]remove all alias definitions.

Return success unless a NAME is not an existing alias.

486.

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[tab]Cause SHELL-COMMAND to be executed when
[tab][tab][tab][tab]KEYSEQ is entered.
-X[tab][tab] 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.

487.

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.

488.

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.

489.

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..

490.

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.

491.

Change 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[tab]force symbolic links to be followed: resolve symbolic links in
[tab]DIR after processing instances of `..'
-P[tab]use the physical directory structure without following symbolic
[tab]links: resolve symbolic links in DIR before processing instances
[tab]of `..'
-e[tab]if the -P option is supplied, and the current working directory
[tab]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.

492.

Print the name of the current working directory.

Options:
-L[tab]print the value of $PWD if it names the current working
[tab]directory
-P[tab]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.

493.

Null command.

No effect; the command does nothing.

Exit Status:
Always succeeds.