BERNARDO BELLO ORTI thinks this is interesting: Chapter 3. Searching and Substitutions From 3. Searching and Substitutions from Classic Shell Scripting by Nelson H. F. Beebe, Arnold Robbins Publisher: O'Reilly Media, Inc. Released: May 2005 Note Read again Share this highlight http://learning.oreilly.com/a/classic-shell-scripting/19750541/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Have an account? Sign in. Minimise Unlock the rest of Classic Shell Scripting and 30,000 other books and videos By clicking this box, you confirm that you have read and agree to the terms and conditions of our Membership Agreement, and you understand that when your trial period ends, you will be required to provide billing information if you wish to continue using the service. Unlock the rest of this book Start a Free 10-Day Trial loading Learn about Safari for Business Have an account? Sign in.