Comments on: Using GNU Grep for Fun and Profit! http://nixshell.wordpress.com/2009/02/11/using-gnu-grep-for-fun-and-profit/ UNIX / Linux Shell Hints and Tips      (a http://steve-parker.org/sh/sh.shtml subproject) Sun, 31 Mar 2013 18:54:44 +0000 hourly 1 http://wordpress.com/ By: robsku http://nixshell.wordpress.com/2009/02/11/using-gnu-grep-for-fun-and-profit/#comment-5407 Tue, 08 Mar 2011 15:15:27 +0000 http://nixshell.wordpress.com/?p=91#comment-5407 Don’t forget that grep has three (at least GNU Grep, I should install different Unices to VirtualBox to test) different regex matching options – if I remember correctly, basic one (which is not much of use), extended (which is OK) and Perl regex, they make matching, especially in complicated shell scripts (or even applications written in shell script) that are very useful in some situations. Without that you might have to call some other heavier and more complex program (which is not as guaranteed to exist as grep).

Also people reading this should note that, as man page of egrep states, it is not recommend to use egrep instead of grep – grep can do all regex greppings too anyway.

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