In automating tasks, we should create scripts, the most common scripting
language available is bash, in my effort to develop personal backup
shell script I need to have bash tutorial, I found “A quick guide to
writing scripts using the bash shell” at
http://pegasus.rutgers.edu/~elflord/unix/bash-tute.html very helpful, as
it focus on the basic concepts.

I also made a google search on an advanced guide, and found: “Advanced
Bash-Scripting Guide” at http://tldp.org/LDP/abs/html/
the pdf version is available at http://tldp.org/LDP/abs/abs-guide.pdf

I hope I can attach the pdf files, but the blog through email feature
doesn’t support attachments.