Sys AdminLinux...BASH Scripting

BASH Scripting

Saturday, July 17, 2004 by digitalpeer

This guide will grow and I get more time and as I run into new things.

The best place to get info on BASH scripting is the Advanced BASH Scripting Guide.

How to properly parse command line options. This is probably better than using the predefined variables such as $1 and $2 to get the command line options.

# Initial declaration.
# a, b, c, d, e, f, and g are the options (flags) expected.
# The : after option 'e' shows it will have an argument passed with it.
while getopts ":abcde:fg" Option
do
	case $Option in
   		a ) # Do something with variable 'a'.
		b ) # Do something with variable 'b'.
		...
		e)  # Do something with 'e', and also with $OPTARG,
		    # which is the associated argument passed with option 'e'.
		...
		g ) # Do something with variable 'g'.
	esac
done
shift $(($OPTIND - 1))
# Move argument pointer to next.