bash: Job Control Builtins
7.2 Job Control Builtins
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'bg'
bg [JOBSPEC ...]
Resume each suspended job JOBSPEC in the background, as if it had
been started with '&'. If JOBSPEC is not supplied, the current job
is used. The return status is zero unless it is run when job
control is not enabled, or, when run with job control enabled, any
JOBSPEC was not found or specifies a job that was started without
job control.
'fg'
fg [JOBSPEC]
Resume the job JOBSPEC in the foreground and make it the current
job. If JOBSPEC is not supplied, the current job is used. The
return status is that of the command placed into the foreground, or
non-zero if run when job control is disabled or, when run with job
control enabled, JOBSPEC does not specify a valid job or JOBSPEC
specifies a job that was started without job control.
'jobs'
jobs [-lnprs] [JOBSPEC]
jobs -x COMMAND [ARGUMENTS]
The first form lists the active jobs. The options have the
following meanings:
'-l'
List process IDs in addition to the normal information.
'-n'
Display information only about jobs that have changed status
since the user was last notified of their status.
'-p'
List only the process ID of the job's process group leader.
'-r'
Display only running jobs.
'-s'
Display only stopped jobs.
If JOBSPEC is given, output is restricted to information about that
job. If JOBSPEC is not supplied, the status of all jobs is listed.
If the '-x' option is supplied, 'jobs' replaces any JOBSPEC found
in COMMAND or ARGUMENTS with the corresponding process group ID,
and executes COMMAND, passing it ARGUMENTs, returning its exit
status.
'kill'
kill [-s SIGSPEC] [-n SIGNUM] [-SIGSPEC] JOBSPEC or PID
kill -l|-L [EXIT_STATUS]
Send a signal specified by SIGSPEC or SIGNUM to the process named
by job specification JOBSPEC or process ID PID. SIGSPEC is either
a case-insensitive signal name such as 'SIGINT' (with or without
the 'SIG' prefix) or a signal number; SIGNUM is a signal number.
If SIGSPEC and SIGNUM are not present, 'SIGTERM' is used. The '-l'
option lists the signal names. If any arguments are supplied when
'-l' is given, the names of the signals corresponding to the
arguments are listed, and the return status is zero. EXIT_STATUS
is a number specifying a signal number or the exit status of a
process terminated by a signal. The '-L' option is equivalent to
'-l'. The return status is zero if at least one signal was
successfully sent, or non-zero if an error occurs or an invalid
option is encountered.
'wait'
wait [-n] [JOBSPEC or PID ...]
Wait until the child process specified by each process ID PID or
job specification JOBSPEC exits and return the exit status of the
last command waited for. If a job spec is given, all processes in
the job are waited for. If no arguments are given, all currently
active child processes are waited for, and the return status is
zero. If the '-n' option is supplied, 'wait' waits for any job to
terminate and returns its exit status. If neither JOBSPEC nor PID
specifies an active child process of the shell, the return status
is 127.
'disown'
disown [-ar] [-h] [JOBSPEC ... | PID ... ]
Without options, remove each JOBSPEC from the table of active jobs.
If the '-h' option is given, the job is not removed from the table,
but is marked so that 'SIGHUP' is not sent to the job if the shell
receives a 'SIGHUP'. If JOBSPEC is not present, and neither the
'-a' nor the '-r' option is supplied, the current job is used. If
no JOBSPEC is supplied, the '-a' option means to remove or mark all
jobs; the '-r' option without a JOBSPEC argument restricts
operation to running jobs.
'suspend'
suspend [-f]
Suspend the execution of this shell until it receives a 'SIGCONT'
signal. A login shell cannot be suspended; the '-f' option can be
used to override this and force the suspension.
When job control is not active, the 'kill' and 'wait' builtins do not
accept JOBSPEC arguments. They must be supplied process IDs.
Info Catalog
bash: Job Control Basics
bash: Job Control
bash: Job Control Variables