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501.

Display status of jobs.

Lists the active jobs. JOBSPEC restricts output to that job.
Without options, the status of all active jobs is displayed.

Options:
-l[tab]lists process IDs in addition to the normal information
-n[tab]list only processes that have changed status since the last
[tab]notification
-p[tab]lists process IDs only
-r[tab]restrict output to running jobs
-s[tab]restrict output to stopped jobs

If -x is supplied, COMMAND is run after all job specifications that
appear in ARGS have been replaced with the process ID of that job's
process group leader.

Exit Status:
Returns success unless an invalid option is given or an error occurs.
If -x is used, returns the exit status of COMMAND.

502.

Remove jobs from current shell.

Removes each JOBSPEC argument from the table of active jobs. Without
any JOBSPECs, the shell uses its notion of the current job.

Options:
-a[tab]remove all jobs if JOBSPEC is not supplied
-h[tab]mark each JOBSPEC so that SIGHUP is not sent to the job if the
[tab]shell receives a SIGHUP
-r[tab]remove only running jobs

Exit Status:
Returns success unless an invalid option or JOBSPEC is given.

503.

Send a signal to a job.

Send the processes identified by PID or JOBSPEC the signal named by
SIGSPEC or SIGNUM. If neither SIGSPEC nor SIGNUM is present, then
SIGTERM is assumed.

Options:
-s sig[tab]SIG is a signal name
-n sig[tab]SIG is a signal number
-l[tab]list the signal names; if arguments follow `-l' they are
[tab]assumed to be signal numbers for which names should be listed

Kill is a shell builtin for two reasons: it allows job IDs to be used
instead of process IDs, and allows processes to be killed if the limit
on processes that you can create is reached.

Exit Status:
Returns success unless an invalid option is given or an error occurs.

513.

Suspend shell execution.

Suspend the execution of this shell until it receives a SIGCONT signal.
Unless forced, login shells cannot be suspended.

Options:
-f[tab]force the suspend, even if the shell is a login shell

Exit Status:
Returns success unless job control is not enabled or an error occurs.

525.

Select words from a list and execute commands.

The WORDS are expanded, generating a list of words. The
set of expanded words is printed on the standard error, each
preceded by a number. If `in WORDS' is not present, `in "$@"'
is assumed. The PS3 prompt is then displayed and a line read
from the standard input. If the line consists of the number
corresponding to one of the displayed words, then NAME is set
to that word. If the line is empty, WORDS and the prompt are
redisplayed. If EOF is read, the command completes. Any other
value read causes NAME to be set to null. The line read is saved
in the variable REPLY. COMMANDS are executed after each selection
until a break command is executed.

Exit Status:
Returns the status of the last command executed.

528.

Execute commands based on conditional.

The `if COMMANDS' list is executed. If its exit status is zero, then the
`then COMMANDS' list is executed. Otherwise, each `elif COMMANDS' list is
executed in turn, and if its exit status is zero, the corresponding
`then COMMANDS' list is executed and the if command completes. Otherwise,
the `else COMMANDS' list is executed, if present. The exit status of the
entire construct is the exit status of the last command executed, or zero
if no condition tested true.

Exit Status:
Returns the status of the last command executed.

543.

Specify how arguments are to be completed by Readline.

For each NAME, specify how arguments are to be completed. If no options
are supplied, existing completion specifications are printed in a way that
allows them to be reused as input.

Options:
-p[tab]print existing completion specifications in a reusable format
-r[tab]remove a completion specification for each NAME, or, if no
[tab]NAMEs are supplied, all completion specifications
-D[tab]apply the completions and actions as the default for commands
[tab]without any specific completion defined
-E[tab]apply the completions and actions to "empty" commands --
[tab]completion attempted on a blank line

When completion is attempted, the actions are applied in the order the
uppercase-letter options are listed above. The -D option takes
precedence over -E.

Exit Status:
Returns success unless an invalid option is supplied or an error occurs.

544.

Display possible completions depending on the options.

Intended to be used from within a shell function generating possible
completions. If the optional WORD argument is supplied, matches against
WORD are generated.

Exit Status:
Returns success unless an invalid option is supplied or an error occurs.