Signals and the kill function

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List of signals on Linux: man -S 7 signal

To send a signal use kill SIG, LIST (process IDs)

For example: kill 9, $pid;

examples/signals/signal.pl

use strict;
use warnings;

my ($sig, @process) = @ARGV;

die "Usage: $0 SIGNAL PROCESS-ID\n" if not @process;
kill $sig, @process;