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本想打算自己造个轮子。发现linux已经有一个圆轮子了

KILLALL5(8)                                                                           Linux System Administrator's Manual                                                                          KILLALL5(8)NAME       killall5 -- send a signal to all processes.SYNOPSIS       killall5 -signalnumber [-o omitpid[,omitpid..]]  [-o omitpid[,omitpid..]..]DESCRIPTION       killall5  is  the  SystemV killall command. It sends a signal to all processes except kernel threads and the processes in its own session, so it won't kill the shell that is running the script it was       called from. Its primary (only) use is in the rc scripts found in the /etc/init.d directory.OPTIONS       -o omitpid              Tells killall5 to omit processes with that process id.NOTES       killall5 can also be invoked as pidof, which is simply a (symbolic) link to the killall5 program.EXIT STATUS       The program return zero if it killed processes.  It return 2 if no process were killed, and 1 if it was unable to find any processes (/proc/ is missing).SEE ALSO       halt(8), reboot(8), pidof(8)

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