skill [signal] [options] expression snice [new priority] [options] expression
These tools are obsolete and unportable. The command syntax is poorly defined. Consider using the killall, pkill, and pgrep commands instead.
The default signal for skill 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 -KILL.
The default priority for snice is +4. Priority numbers range from +20 (slowest) to -20 (fastest). Negative priority numbers are restricted to administrative users.
Selection criteria can be: terminal, user, pid, command. The options below may be used to ensure correct interpretation.
The behavior of signals is explained in signal(7) manual page.
kill(1), kill(2), killall(1), nice(1), pkill(1), renice(1), signal(7)
No standards apply.
Albert Cahalan wrote skill and snice in 1999 as a replacement for a non-free version.
Please send bug reports to