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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.

337.

Obsolete. See `declare'.

338.

Create a local variable called NAME, and give it VALUE. LOCAL
can only be used within a function; it makes the variable NAME
have a visible scope restricted to that function and its children.

339.

Output the ARGs. If -n is specified, the trailing newline is
suppressed. If the -e option is given, interpretation of the
following backslash-escaped characters is turned on:
[tab]\a[tab]alert (bell)
[tab]\b[tab]backspace
[tab]\c[tab]suppress trailing newline
[tab]\E[tab]escape character
[tab]\f[tab]form feed
[tab]\n[tab]new line
[tab]\r[tab]carriage return
[tab]\t[tab]horizontal tab
[tab]\v[tab]vertical tab
[tab]\\[tab]backslash
[tab]\0nnn[tab]the character whose ASCII code is NNN (octal). NNN can be
[tab][tab]0 to 3 octal digits

You can explicitly turn off the interpretation of the above characters
with the -E option.