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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.

499.

Display information about builtin commands.

Displays brief summaries of builtin commands. If PATTERN is
specified, gives detailed help on all commands matching PATTERN,
otherwise the list of help topics is printed.

Options:
-d[tab]output short description for each topic
-m[tab]display usage in pseudo-manpage format
-s[tab]output only a short usage synopsis for each topic matching
[tab]PATTERN

Arguments:
PATTERN[tab]Pattern specifiying a help topic

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

500.

Display or manipulate the history list.

Display the history list with line numbers, prefixing each modified
entry with a `*'. An argument of N lists only the last N entries.

Options:
-c[tab]clear the history list by deleting all of the entries
-d offset[tab]delete the history entry at offset OFFSET.

-a[tab]append history lines from this session to the history file
-n[tab]read all history lines not already read from the history file
-r[tab]read the history file and append the contents to the history
[tab]list
-w[tab]write the current history to the history file
[tab]and append them to the history list

-p[tab]perform history expansion on each ARG and display the result
[tab]without storing it in the history list
-s[tab]append the ARGs to the history list as a single entry

If FILENAME is given, it is used as the history file. Otherwise,
if $HISTFILE has a value, that is used, else ~/.bash_history.

If the $HISTTIMEFORMAT variable is set and not null, its value is used
as a format string for strftime(3) to print the time stamp associated
with each displayed history entry. No time stamps are printed otherwise.

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

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.