Mastering Linux Shell Scripting - Second Edition

Passing parameters with options

To pass parameters along with options simultaneously, you must separate them with a double dash, like this:

$ ./script1.sh -a -b -c -- p1 p2 p3

Using the previous technique, we can iterate over the options till we reach the double dash, then we will iterate over the parameters:

#!/bin/bashwhile [ -n "$1" ]docase "$1" in-a) echo "-a option found" ;;-b) echo "-b option found";;-c) echo "-c option found" ;;--) shiftbreak ;;*) echo "Option $1 not an option";;esacshiftdone#iteration over options is finished here.#iteration over parameters started.num=1for param in $@doecho "#$num: $param"num=$(( $num + 1 ))done

Now if we run it with parameters and options combined, we should see a list of options and another list ...