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508.

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.

509.

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.

510.

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..

511.

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.

512.

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
[tab][tab]links in DIR after processing instances of `..'
-P[tab]use the physical directory structure without following
[tab][tab]symbolic links: resolve symbolic links in DIR before
[tab][tab]processing instances of `..'
-e[tab]if the -P option is supplied, and the current working
[tab][tab]directory cannot be determined successfully, exit with
[tab][tab]a non-zero status
-@[tab]on systems that support it, present a file with extended
[tab][tab]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.

513.

Print the name of the current working directory.

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

514.

Null command.

No effect; the command does nothing.

Exit Status:
Always succeeds.

515.

Return a successful result.

Exit Status:
Always succeeds.

516.

Return an unsuccessful result.

Exit Status:
Always fails.

517.

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.