Mastering Regular Expressions, Jeffery E. F. Friedl, O'Reilly, ISBN 1-56592-257-3.
Learning the bash Shell, 2nd Edition, Cameron Newham and Bill Rosenblatt, O'Reilly, ISBN 1-56592-347-2.
UNIX Power Tools, 2nd Edition, Jerry Peek, Tim O'Reilly and Mike Loukides, O'Reilly, ISBN 1-56592-260-3.
All listings referred to in this article are available by anonymous download in the file ftp://ftp.ssc.com/pub/lj/listings/issue73/3771.tgz.