Linux tip: Bash parameters and parameter expansions .

[elsiddik]

Do you sometimes wonder how to use parameters with your scripts, and
how to pass them to internal functions or other scripts? Do you need
to do simple validity tests on parameters or options, or perform
simple extraction and replacement operations on the parameter strings?
This tip helps you with parameter use and the various parameter
expansions available in the bash shell.

just click here -- http://www.ibm.com/developerworks/linux/library/l-bash-parameters.html

zaher el siddik
http://elsiddik.googlepages.com/
http://elsiddik.blogspot.com/