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bg
bg [jobspec]Place jobspec into the background, as if it had been started with `&'. If jobspec is not supplied, the current job is used.
fg
fg [jobspec]Bring jobspec into the foreground and make it the current job. If jobspec is not supplied, the current job is used.
jobs
jobs [-lpn] [jobspec] jobs -x command [jobspec]
The first form lists the active jobs. The -l option lists
process IDs in addition to the normal information; the -p
option lists only the process ID of the job's process group
leader. The -n option displays only jobs that have
changed status since last notfied. 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.
suspend
suspend [-f]Suspend the execution of this shell until it receives a
SIGCONT signal. The -f option means to suspend
even if the shell is a login shell.
When job control is active, the kill and wait
builtins also accept jobspec arguments.
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