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1.27 How Background Processing Works

Remember that the shell sits there listening to what you type, and calling other programs to do jobs that it doesn't have built-in commands to do.

Normally, when the shell calls another program, it waits for the other program to finish. All the ampersand (&) at the end of a command line does is tell the shell not to wait.

Both the Bourne shell and the C shell allow background processing. But, on UNIX systems that have job control (12.1), the C shell, bash and ksh give you a lot of extra capabilities for manipulating background processes.

Here's the tip of the iceberg:

- TOR


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