http://stackoverflow.com/questions/3043978/bash-how-to-check-if-a-process-id-pid-exists
https://bugzilla.redhat.com/show_bug.cgi?id=835838
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http://stackoverflow.com/questions/3043978/bash-how-to-check-if-a-process-id-pid-exists
https://bugzilla.redhat.com/show_bug.cgi?id=835838
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