mirror of
https://github.com/rawiriblundell/wiki.bash-hackers.org
synced 2024-11-01 16:43:08 +01:00
66 lines
2.2 KiB
Plaintext
66 lines
2.2 KiB
Plaintext
====== The kill builtin command ======
|
|
|
|
===== Synopsis =====
|
|
<code>kill [-s SIGNAL | -n SIGNALNUMBER | -SIGNAL] PID|JOB</code>
|
|
<code>kill -l|-L [SIGNAL...]</code>
|
|
|
|
===== Description =====
|
|
The ''kill'' command is used to send signals to processes specified by their ''PID'' or their ''JOB''-specification.
|
|
|
|
The signal(s) to be specified can have the following formats:
|
|
* Numerical: The signal is specified using its constant numeric value. Be aware that not all systems have identical numbers for the signals.
|
|
* Symbolic (long): The signal is specified using the same name that is used for the constant/macro in the C API (''SIG<name>'')
|
|
* Symbolic (short): The signal is specified using the name from the C API without the ''SIG''-prefix (''<name>'')
|
|
|
|
Without any specified signal, the command sends the ''SIGTERM''-signal.
|
|
|
|
The ''kill'' command is a Bash builtin command instead of relying on the external ''kill'' command of the operating system to
|
|
* be able to use shell job specifications instead of Unix process IDs
|
|
* be able to send signals ("kill something") also, when your process limit is reached
|
|
|
|
==== Options ====
|
|
|
|
^Option ^Description ^
|
|
|''-s SIGNAL'' |specifies the signal to send |
|
|
|''-n SIGNALNUMBER'' |specifies the signal to send |
|
|
|''-SIGNAL'' |specifies the signal to send |
|
|
|''-l [SIGNAL...]'' |Lists supported/known signal numbers and their symbolic name. If ''SIGNAL'' is given, only list this signal, translated (if a number is given the symbolic name is printed, and vice versa) |
|
|
|''-L [SIGNAL...]'' |Same as ''-l [SIGNAL]'' (compatiblity option) |
|
|
|
|
==== Return status ====
|
|
|
|
^Status ^Reason ^
|
|
|0 |no error/success |
|
|
|!=0 |invalid option |
|
|
|!=0 |invalid signal specification |
|
|
|!=0 |error returned by the system function (e.g. insufficient permissions to send to a specific process) |
|
|
|
|
===== Examples =====
|
|
|
|
==== List supported signals ====
|
|
|
|
<code>
|
|
kill -l
|
|
</code>
|
|
|
|
==== Send KILL to a process ID ====
|
|
|
|
<code>
|
|
kill -9 12345
|
|
</code>
|
|
|
|
<code>
|
|
kill -KILL 12345
|
|
</code>
|
|
|
|
<code>
|
|
kill -SIGKILL 12345
|
|
</code>
|
|
|
|
===== Portability considerations =====
|
|
|
|
* POSIX(R) and ISO C only standardize symbolic signal names (no numbers) and a default action
|
|
|
|
===== See also =====
|
|
|