shell图形化菜单界面

如下写一个优雅的shell图形化界面

#!/bin/bash# simple script menufunction diskspace {        clear        df -h}function whoseon {    clear    who}function memusage {    clear    cat /proc/meminfo}function menu {    clear    echo    echo -e "\t\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}while [ 1 ]do    menu    case $option in        0)        break ;;        1)        diskspace ;;        2)        whoseon ;;        3)        memusage ;;        *)        clear        echo "Sorry, wrong selection";;    esac    echo -en "\n\n\t\t\tHit any key to continue"    read -n 1 linedoneclear