Give shell script options

1 min read · shell script

Requirements

Place this in a file called options.sh, and make it executable.

 1#!/bin/sh
 2
 3echo "This script is called $0"
 4
 5while getopts oe: choice ; do
 6    case "$choice" in
 7        o)
 8        echo "This is option number '${OPTIND}'."
 9        ;;
10        e) echo "Option number '${OPTIND}' uses this variable: '${OPTARG}'."
11        ;;
12        \?) echo "That's not an option."
13        exit 1
14        ;;
15    esac
16done
17shift "$(($OPTIND -1))"
18
19echo "The standard arguments are: $@"

Try the options:

1./options.sh -o
2./options.sh -e elephant
3./options.sh Some random words
4./options.sh -efox Some other words

Try the script again, without the shift statement.

NB: You can change choice to any variable, but you must use OPTARG to show an option's argument and OPTIND to show the index of that argument.