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489.

Enable 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[tab]print a list of builtins showing whether or not each is enabled
-n[tab]disable each NAME or display a list of disabled builtins
-p[tab]print the list of builtins in a reusable format
-s[tab]print only the names of Posix `special' builtins

Options controlling dynamic loading:
-f[tab]Load builtin NAME from shared object FILENAME
-d[tab]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.

490.

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.

491.

Parse 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.

492.

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[tab]pass NAME as the zeroth argument to COMMAND
-c[tab][tab]execute COMMAND with an empty environment
-l[tab][tab]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.

493.

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.

494.

Exit a login shell.

Exits a login shell with exit status N. Returns an error if not executed
in a login shell.

495.

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[tab]select which editor to use. Default is FCEDIT, then EDITOR,
[tab][tab]then vi
-l [tab]list lines instead of editing
-n[tab]omit line numbers when listing
-r[tab]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.

496.

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.

497.

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.

498.

Remember 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[tab][tab]forget the remembered location of each NAME
-l[tab][tab]display in a format that may be reused as input
-p pathname[tab]use PATHNAME is the full pathname of NAME
-r[tab][tab]forget all remembered locations
-t[tab][tab]print the remembered location of each NAME, preceding
[tab][tab]each location with the corresponding NAME if multiple
[tab][tab]NAMEs are given
Arguments:
NAME[tab][tab]Each NAME is searched for in $PATH and added to the list
[tab][tab]of remembered commands.

Exit Status:
Returns success unless NAME is not found or an invalid option is given.