Bash Programming Tutorial

http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html
http://www.tldp.org/LDP/abs/html/
http://www.tldp.org/LDP/Bash-Beginners-Guide/html/Bash-Beginners-Guide.html
http://linuxconfig.org/bash-scripting-tutorial
http://www.ibm.com/developerworks/library/l-bash/