!/bin/bash
#
输入数字运行相应命令
#
echo "cmd menu 1-date 2-ls 3-who 4-pwd 0-exit "
while :
do
捕获用户键入值
read -p "please input number :" n
n1=echo $n|sed s'/[0-9]//'g
空输入检测
if [ -z "$n" ]
then
continue
fi
非数字输入检测
if [ -n "$n1" ]
then
exit 0
fi
break
done
case $n in
1)
date
;;
2)
ls
;;
3)
who
;;
4)
pwd
;;
0)
break
;;
输入数字非1-4的提示
*)
echo "please input number is [1-4]"
esac
