使用脚本菜单

#!/bin/bash

function menu {
    clear
    echo
    echo -e "\t\tSys Admin Menu\n"
    echo -e "\t1. Display disk space"
    echo -e "\t2. Display logged on users"
    echo -e "\t3. Display memory usage"
    echo -e "\t0. Exit program\n\n"
    echo -en "\t\tEnter option:"
    read -n 1 option
}

function diskspace {
    clear 
    df -k
}

function whoseon {
    clear
    who
}

function menusage {
    clear
    cat /proc/meminfo
}

while [ 1 ]
do
    menu
    case $option in
    0) 
        break;;
    1) 
        diskspace;;
    2)
        whoseon;;
    3)
        menusage;;
    *)
        clear
        echo "Sorry, wrong selection";;
    esac
    echo -en "\n\n\t\tHit any key to continue"
    read -n 1 line
done
clear