Wrestling with Your Jobs
Every program you run is a job according to the UNIX system, and although it might not be obvious, you have the ability to start and stop them at any time, and more.
Task 16.1: Job Control in the Shell: Stopping Jobs
 | Whether you're requesting a man page, listing files with ls, starting vi, or running just about any UNIX command, you're starting one or more processes. In UNIX, any program that's running is a process. You can have multiple processes running at once. The pipeline ls -l | sort | more invokes three processes: ls, sort, and more. Processes in both the C and Korn shells are also known as jobs, and the program ... |
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