case 练习

#!/bin/bash

RED_COLOR="\E[1;31m"
GREEN_COLOR="\E[1;32m"
YELLOW_COLOR="\E[1;33m"
BLUE_COLOR="\E[1;34m"
RES="\E[0m"

function usage(){
        echo "USAGE: $0 {1|2|3|4}"
        exit 1
}

function menu(){
        cat << END
                =============================
                1.apple
                2.pear
                3.banana
                4.cherry
                =============================
END
}


function choice(){
read -p "Please input a number to choice." num
case $num in
        1)
                echo -e "${RED_COLOR}apple${RES}"
                ;;
        2)
                echo -e "${GREEN_COLOR}pear${RES}"
                ;;
        3)
                echo -e "${YELLOW_COLOR}banana${RES}"
                ;;
        4)
                echo -e "${BLUE_COLOR}cherry${RES}"
                ;;
        *)
                usage
esac
}

function main(){
        menu
        choice
}
main