shell case语句
Shell case语句为多选择语句。可以用case语句匹配一个值与一个模式，如果匹配成功，执行相匹配的命令。case语句格式如下：-----------------------
case 值 in
模式1)
command1
command2
...
commandN
;;
模式2）
command1
command2
...
commandN
;;
esac
-----------------------------------------------------
echo 'Input a number between 1 to 4'
echo 'Your number is:\c'
read aNum
case $aNum in
1)echo 'You select 1'
;;
2)echo 'You select 2'
;;
3)echo 'You select 3'
;;
4)echo 'You select 4'
;;
*)echo 'You do not select a number between 1 to 4'
;;
esac
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