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Only the super-user may send signals to other users' processes.
The options are as follows:
| | |
| A symbolic signal name specifying the signal to be sent instead of the default TERM. | |
| | |
| If no operand is given, list the signal names; otherwise, write the signal name corresponding to exit_status. | |
| signal_name | |
| A symbolic signal name specifying the signal to be sent instead of the default TERM. | |
| signal_number | |
| A non-negative decimal integer, specifying the signal to be sent instead of the default TERM. | |
The following PIDs have special meanings:
| 0 | The signal is sent to all processes whose group ID is equal to the process group ID of the sender, and for which the process has permission. |
| -1 | If superuser, broadcast the signal to all processes; otherwise broadcast to all processes belonging to the user. |
| -PGID | The signal is sent to all processes that belong to the specified process group ID (PGID). |
Some of the more commonly used signals:
| 1 | HUP (hang up) |
| 2 | INT (interrupt) |
| 3 | QUIT (quit) |
| 6 | ABRT (abort) |
| 9 | KILL (non-catchable, non-ignorable kill) |
| 14 | ALRM (alarm clock) |
| 15 | TERM (software termination signal) |
Some shells may provide a builtin kill command which is similar or identical to this utility. Consult the builtin(1) manual page.
kill 142 157
Send the hangup signal ( SIGHUP) to the process with PID 507:
kill -s HUP 507
Terminate the process group with PGID 117:
kill -- -117
| KILL (1) | October 3, 2016 |
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