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A signal is an event sent by the kernel to a running program.

The signals can arrive at any time and software can choose what to do when it arrives: it can decide to ignore it or may decide to execute a signal handler and continue with what he did.

There are 31 different signals, and you can see them with:

kill -l

Of these there are 6 to be known by system administrators:

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May 12th, 2011

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