Tutorials

Photoshop Tutorials - Good-Tutorials.com started in August 2002 as Photoshop Design. It migrated to its present form in February 2003. Good-Tutorials now houses one of the largest collections of tutorials for Adobe Photoshop on the internet today.

Site includes Bruce Barnett's tutorials on UNIX shell programming and various other arcane subjects.

Shell Quotes - How to use quotes in a shell script.
Regular Expressions - Written for Solaris, so your milage my vary..
SED - The Stream Editor - Editing a data stream.
Bourne Shell - Everything you wanted to know.
AWK - The basic power tool for UNIX.

What is a Crontab?
A cron is a utility that allows tasks to automatically run in the background of the system at regular intervals by use of the cron daemon. Crontab (CRON TABle) is a file which contains the schedule of cron entries to be run and at what times they are to be run. This can be quite useful. For example, you may have a personal temporary directory that you wish to be cleaned out once a day to keep your quota from being exceeded. This is where cron scheduling comes in to play. Not all systems allow for a cron schedule to be setup. You need to see your system administrator to see if it is available on your system.