Command-line parameters passed along with commands are also called positional parameters. Many times, we need to pass options such as -f and -v along with a positional parameter.
Let's look at an example for passing the -x or-y options along with commands.
Write shell script getopt.sh, as follows:
#!/bin/bash USAGE="usage: $0 -x -y" while getopts :xy: opt_char do case $opt_char in x) echo "Option x was called." ;; y) echo "Option y was called. Argument called is $OPTARG" ;; ?) echo "$OPTARG is not a valid option." echo "$USAGE" ;; esac done
Execute this program:
You will learn about the switch and case statements in the next chapters. In this script, if option -x is passed, a case statement for x will ...