shell case esac语句

shell脚本如下代码

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

输出结果
Input a number between 1 to 4
Your number is:3
You select 3

再举例
#!/bin/bash
option="${1}"
case ${option} in
-f) FILE="${2}"
echo "File name is $FILE"
;;
-d) DIR="${2}"
echo "Dir name is $DIR"
;;
*)
echo "`basename ${0}`:usage: [-f file] | [-d directory]"
exit 1 # Command to come out of the program with status 1
;;
esac

$./test.sh
test.sh: usage: [ -f filename ] | [ -d directory ]
$ ./test.sh -f index.htm
$ vi test.sh
$ ./test.sh -f index.htm
File name is index.htm
$ ./test.sh -d unix
Dir name is unix
$