KILL
Section: User Commands (1)
Updated: 202-1-27
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NAME
kill - send a signal to one or more processes
SYNOPSIS
kill
[
-q~value|
--queue~value]
pid ...
kill
-signal
[
-q~value|
--queue~value]
pi-o-pgid ...
kill
-s~signal
[
-q~value|
--queue~value]
pi-o-pgid ...
kill
--signal~signal
[
-q~value|
--queue~value]
pi-o-pgid ...
kill -l~[
signal]
kill --list~[
signal]
kill -L
kill --table
DESCRIPTION
kill
sends a signal to one or more processes by
pid
or
pgid,
a process or process group identifier.
signal(7)
explains the varieties and behavior of signals.
kill's
default signal is TERM.
The
-l
and
-L
options list available signals.
Particularly useful signals include HUP,
INT, KILL, STOP, CONT, and 0.
Specify signals
by number,
by name,
or by name with a [lq]SIG[rq] prefix;
for example,
-9,
-SIGKILL,
and
-KILL
are equivalent.
A negative operand selects a process group;
see the PGID column in
ps(1)
command output.
A
pid
of
-1
is special;
it indicates all processes except the
kill
process itself and
init(8).
The
-q
option uses an alternative signaling method to
to additionally transmit an integral
value
to a receiving process.
If that process has installed a handler for the signal and specified the
SA_SIGINFO flag to
sigaction(2),
then it can obtain this datum via the
si_value
field of the
siginfo_t
structure.
OPTIONS
- -signal
-
-s~signal
--signal~signal
Send
signal
by name or number as described above.
If
signal
is 0 (zero),
kill
sends no signal,
but still validates its operands;
this behavior permits the caller to check whether
the specified
pids
and/or
pgids
exist and it has permission to send them signals.
- -q~value
-
--queue~value
Use
sigqueue(3)
rather than
kill(2)
to additionally send
value
to each
pid
or
pgid.
- -l~[signal]
-
--list~[fIsignal]
Without an argument,
list signal names.
The optional argument causes
kill
to convert the specified
signal
from name to numeric form,
or vice versa as appropriate,
and report the translation.
- -L
-
--table
List signal names in tabular format.
NOTES
The shell (comman-line interpreter) often has a buil-in [lq]kill[rq]
command.
You may need to run the command described here as
/bin/:kill
to override the shell buil-in.
If you use a negative operand,
specify a signal by name or number first so that
kill
can distinguish it from a process group.
For example,
the command
[lq]kill 123 -9[rq]
is ambiguous;
it could mean to kill process 123 with signal 9,
or to kill process 123 and process group 9 with the default signal.
EXAMPLES
- kill -HUP -1
-
Send hangup signal to all the processes you can.
- kill -l 11
-
Report name corresponding to signal number 11.
- kill 123 543
-
Send the default signal,
SIGTERM,
to processes 123 and
543.
- kill-SIGTERM-123
-
Send the signal SIGTERM to process group 123.
SEE ALSO
kill(2),
killall(1),
nice(1),
pkill(1),
renice(1),
signal(7),
sigqueue(3),
skill(1)
REPORTING BUGS
Please send bug reports to
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- NOTES
-
- EXAMPLES
-
- SEE ALSO
-
- REPORTING BUGS
-
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