Section: User Commands (1)
Updated: October 2011
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kill - send a signal to a process
The default signal for kill is TERM. Use -l or -L to list available signals. Particularly useful signals include HUP, INT, KILL, STOP, CONT, and 0. Alternate signals may be specified in three ways: -9, -SIGKILL or -KILL. Negative PID values may be used to choose whole process groups; see the PGID column in ps command output. A PID of -1 is special; it indicates all processes except the kill process itself and init.
Your shell (command line interpreter) may have a built-in kill command. You may need to run the command described here as /bin/kill to solve the conflict.
kill?(2), killall?(1), nice?(1), pkill?(1), renice?(1), signal?(7), skill?(1)
This command meets appropriate standards. The -L flag is Linux-specific.
Albert Cahalan wrote kill in 1999 to replace a bsdutils one that was not standards compliant. The util-linux one might also work correctly.
Please send bug reports to
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