skill Man page

SKILL(1) User Commands SKILL(1)


skill, snice – send a signal or report process status


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

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

The default priority for snice is +4. Priority numbers range from +20
(slowest) to -20 (fastest). Negative priority numbers are restricted
to administrative users.


-f, –fast
Fast mode. This option has not been implemented.

-i, –interactive
Interactive use. You will be asked to approve each action.

-l, –list
List all signal names.

-L, –table
List all signal names in a nice table.

-n, –no-action
No action; perform a simulation of events that would occur but
do not actually change the system.

-v, –verbose
Verbose; explain what is being done.

-w, –warnings
Enable warnings. This option has not been implemented.

-h, –help
Display help text and exit.

-V, –version
Display version information.



Selection criteria can be: terminal, user, pid, command. The options
below may be used to ensure correct interpretation.

-t, –tty tty
The next expression is a terminal (tty or pty).

-u, –user user
The next expression is a username.

-p, –pid pid
The next expression is a process ID number.

-c, –command command
The next expression is a command name.

–ns pid
Match the processes that belong to the same namespace as pid.

–nslist ns,…
list which namespaces will be considered for the –ns option.
Available namespaces: ipc, mnt, net, pid, user, uts.

The behavior of signals is explained in signal(7) manual page.

snice -c seti -c crack +7
Slow down seti and crack commands.

skill -KILL -t /dev/pts/*
Kill users on PTY devices.

skill -STOP -u viro -u lm -u davem
Stop three users.


kill, kill, killall, nice, pkill, renice, 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 ⟨⟩

procps-ng October 2011 SKILL(1)

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