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Howard
Asked: 2012-10-11 01:19:03 +0800 CST

Meaning of killall -0

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I see from many place the follow command is used to check if a process exists, e.g.

killall -0 nginx

But from the documentation I can't see anything related to this argument, can anyone explain?

linux

1 Answers

  1. Best Answer

    man kill

    If sig is 0, then no signal is sent, but error checking is still performed; this can be used to check for the existence of a process ID or process group ID.

    killall kill processes by name instead of PID on Linux & BSD-based systems. In other Operating Systems (Solaris), the killall command is used to terminate all running processes.

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