Bash

• Homepage
• http://www.linuxdoc.org/HOWTO/Bash-Prog-Intro-HOWTO.html
• Bash Guide for Beginners
• http://www.ling.helsinki.fi/users/reriksso/unix/shell.html
• Advanced Bash Scripting Guide
• Linux Shell Scripting Tutorial
• Aliens Bash Tutorial

Tips and tricks

get first character of a string

FIRST=${STRING:0:1}