建立菜单

方法一：用here文档和case语句建立

#!/bin/bash

while true

do

cat<<- ENDIT //<<-忽略制表符TAB

1)linux
2)xterm
3)sun

4)quit

ENDIT
read choice
case "$choice" in
1)

TERM=linux
export TERM
;;

2)

TERM=xterm
export TERM
;;

3)

TERM=SUN
export TERM
;;

4)

　　break;;

esac

done

方法二：用select循环命令和case命令

1）如果要退出select循环，可以用break
2）如果REPLY变量为空，将会重新显示菜单

#!/bin/bash

PS3="Please choose terminal type[1-4] : "
select choice in wyse50 vt200 xterm sun
do

case $REPLY in
1)

echo wyse50
break;;

2)

echo vt200
break;;

3)

echo xterm
break;;

4)

echo sun
break;;

*)

echo error choice,retry
REPLY=
;;

esac

done 

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