
pgrep is a command-line utility initially written for use with the Solaris 7 operating system. It has since been reimplemented for Linux and the BSDs (Dragonfly BSD, FreeBSD, NetBSD, and OpenBSD). It searches for all the named processes that can be specified as extended regular expression patterns, and—by default—returns their process ID. Alte...
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http://en.wikipedia.org/wiki/Pgrep

Look up processes based on name and other attributes, see Section 4.1.4.
Found on
http://www.tldp.org/LDP/intro-linux/html/gloss.html
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