bg — Place a job in BackGround
Summary:
Normally user can run a job in background, by adding & at end of the
command (ex: sleep 10 &).
bg is a shell command. It is used to move a job from foreground to the
background, as if it had been started with `&’. If JOB is not present,
the shell’s notion of the current job is used.
Examples:
$ sleep 100 — Start a dummy job in foreground.
Press Ctrl+z to stop the current job.
$ bg — Move the last stopped job to background.
$ sleep 150 — Dummy job 1
Press Ctrl+z to stop the current job.
$ sleep 140 — Dummy job 2
Press Ctrl+z to stop the current job.
$ sleep 130 — Dummy job 3
Press Ctrl+z to stop the current job.
$ jobs — List all active jobs.
$ bg 2 — Move the 2nd active job to background.
Read: help bg, jobs
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