pkill
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pkill is a command line utility initially written for use with the Solaris 7 operating system. It has since been reimplemented for Linux and OpenBSD.
As with the kill and killall commands, pkill is used to send signals. The pkill command allows the use of extended regular expression patterns and other matching criteria.
Example usage
Kill the most recently created acroread process
$ pkill -n acroread
Send USR1 signal to acroread process
pkill -USR1 acroread