Shell/Bash Tips

How do I use Shell redirection: http://www.losurs.org/docs/redirection
How to redirect stderr and stdout to a file plus display at the same time: http://www.travishartwell.net/blog/2006/08/19_2220.tbh
Use return $var instead of exit $var in function. Exit will terminate the script. And if you do not return, the function assume an exist and terminate the script!!!
Bash single/double brackets: [, [[, (, ((, ${}, http://stackoverflow.com/questions/2188199/bash-double-or-single-bracket-parentheses-curly-braces
Bash 3.1->3.2 upgrade has updated the regular expressions: http://stackoverflow.com/questions/218156/bash-regex-with-quotes/218217#218217

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