June 2012
Beginner
227 pages
5h 43m
English
Content preview from Macintosh Terminal Pocket Guide
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Shell Job Control
jobs | List your jobs. |
| Run a job in the background. |
| Suspend the current (foreground) job. |
suspend | Suspend a shell. |
fg | Unsuspend a job: bring it into the foreground. |
bg | Make a suspended job run in the background. |
All shells have job control: the ability to run programs in the background (multitasking behind the scenes) and foreground (running as the active process at your shell prompt). A job is simply the shell’s unit of work. When you run a command interactively, your current shell tracks it as a job. When the command completes, the associated job disappears. Jobs are at a higher level than OS X processes (discussed in Viewing Processes); OS X knows nothing about them. They are merely constructs of the shell. Some important vocabulary about job control is:
- Foreground job
Running in a shell, occupying the shell prompt so you cannot run another command
- Background job
Running in a shell, but not occupying the shell prompt, so you can run another command in the same shell
- Suspend
To stop a foreground job temporarily
- Resume
To cause a suspended job to start running again
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