bash script sample

1.create a select menu in a shell script?

#!/bin/bash

PS3='Please enter your choice: '
options=("Option 1" "Option 2" "Option 3" "Quit")
select opt in "${options[@]}"
do
    case $opt in
        "Option 1")
            echo "you chose choice 1"
            ;;
        "Option 2")
            echo "you chose choice 2"
            ;;
        "Option 3")
            echo "you chose choice 3"
            ;;
        "Quit")
            break
            ;;
        *) echo invalid option;;
    esac
done

2.create a Function in a shell script?

#!/bin/bash
           function quit {
               exit
           }
           function hello {
               echo Hello!
           }
           hello
           quit
           echo foo