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Monitoring Processes with Kill
August 21, 2008 (2:00:00 AM) - 3 months ago
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If you have a process ID but aren't sure whether it's valid, you can use the most unlikely of candidates to test it: the kill command. If you don't see any reference to this on the kill(1) man page, check the info pages. The man/info page states that signal 0 is special and that the exit code from kill tells whether a signal could be sent to the specified process (or processes).
Read more at: linuxjournal.com
