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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