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327.

Resume the next iteration of the enclosing FOR, WHILE or UNTIL loop.
If N is specified, resume at the N-th enclosing loop.

328.

Run a shell builtin. This is useful when you wish to rename a
shell builtin to be a function, but need the functionality of the
builtin within the function itself.

329.

Returns 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.

330.

Change the current directory to DIR. The variable $HOME is the
default DIR. 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, i.e. `.'. 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, then try the word as a variable
name. If that variable has a value, then cd to the value of that
variable. The -P option says to use the physical directory structure
instead of following symbolic links; the -L option forces symbolic links
to be followed.

331.

Print the current working directory. With the -P option, pwd prints
the physical directory, without any symbolic links; the -L option
makes pwd follow symbolic links.

332.

No effect; the command does nothing. A zero exit code is returned.

333.

Return a successful result.

334.

Return an unsuccessful result.

335.

Runs COMMAND with ARGS ignoring shell functions. If you have a shell
function called `ls', and you wish to call the command `ls', you can
say "command ls". If the -p option is given, a default value is used
for PATH that is guaranteed to find all of the standard utilities. If
the -V or -v option is given, a string is printed describing COMMAND.
The -V option produces a more verbose description.

336.

Declare variables and/or give them attributes. If no NAMEs are
given, then display the values of variables instead. The -p option
will display the attributes and values of each NAME.

The flags are:

-a[tab]to make NAMEs arrays (if supported)
-f[tab]to select from among function names only
-F[tab]to display function names (and line number and source file name if
[tab]debugging) without definitions
-i[tab]to make NAMEs have the `integer' attribute
-r[tab]to make NAMEs readonly
-t[tab]to make NAMEs have the `trace' attribute
-x[tab]to make NAMEs export

Variables with the integer attribute have arithmetic evaluation (see
`let') done when the variable is assigned to.

When displaying values of variables, -f displays a function's name
and definition. The -F option restricts the display to function
name only.

Using `+' instead of `-' turns off the given attribute instead. When
used in a function, makes NAMEs local, as with the `local' command.