#!/bin/shpath=/server/scripts[ ! -d "$path" ] && mkdir $path#menucat <<END 1.[install lamp] 2.[install lnmp] 3.[exit] pls input the num you want:ENDread numexpr $num + 1 &>/dev/null[ $? -ne 0 ] && { echo "the num you input must be {1|2|3}" exit 1}[ $num -eq 1 ] && { echo "start installing lamp." sleep 2; [ -x "$path/lamp.sh" ] || { echo "$path/lamp.sh does not exist or can not be exec." exit 1 } $path/lamp.sh exit $?}[ $num -eq 2 ] && { echo "start installing LNMP." sleep 2; [ -x "$path/lnmp.sh" ] || { echo "$path/lnmp.sh does not exist or can not be exec." exit 1 } $path/lnmp.sh exit $?}[ $num -eq 3 ] && { echo bye. exit 3}#[[ ! $num =~ [1-3] ]]&&{[ ! $num -eq 1 -o ! $num -eq 2 -o ! $num -eq 3 ] && { echo "the num you input must be {1|2|3}" echo "Input ERROR" exit 4}原文：http://www.cnblogs.com/shengy/p/7428529.html