#!/bin/bash # cat << EOF cpu) show cpu information; mem) show memory information; disk) show disk information; quit) quit ############################################################# EOF read -p "Enter a option:" option while [ "$option" != 'cpu' -a "$option" != 'mem' -a "$option" != 'disk' -a "option" != 'quit' ];do read -p "Wrong option,please Enter again:" option done if [ "$option" == 'cpu' ];then lscpu elif [ "$option" == 'mem' ];then cat /proc/meminfo elif [ "$option" == 'disk' ];then fdisk -l else echo "Quit" exit 0 fi ~