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kill [ -s signal_name | -n signal_number | -sig ] job ...
kill -l [ sig ... ]
Sends either SIGTERM or the specified signal to the given jobs
or processes. Signals are given by number or by names, with or
without the `SIG' prefix. If the signal being sent is not
`KILL' or `CONT', then the job will be sent a `CONT' signal if
it is stopped. The argument job can be the process ID of a job
not in the job list. In the second form, kill -l, if sig is not
specified the signal names are listed. Otherwise, for each sig
that is a name, the corresponding signal number is listed. For
each sig that is a signal number or a number representing the
exit status of a process which was terminated or stopped by a
signal the name of the signal is printed.
On some systems, alternative signal names are allowed for a few
signals. Typical examples are SIGCHLD and SIGCLD or SIGPOLL and
SIGIO, assuming they correspond to the same signal number. kill
-l will only list the preferred form, however kill -l alt will
show if the alternative form corresponds to a signal number.
For example, under Linux kill -l IO and kill -l POLL both output
29, hence kill -IO and kill -POLL have the same effect.
Many systems will allow process IDs to be negative to kill a
process group or zero to kill the current process group.
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