case语句和elif语句

[oracle@jhoa 6]$ cat elif.sh 
var="$1"
if [ $var =  "01" ]
then
echo "Jan"
elif [ $var = "02" ]
then
echo "Feb"
elif [ $var = "03" ]
then
echo "Mar"
elif [ $var = "04" ]
then
echo "Apr"
fi
[oracle@jhoa 6]$ sh elif.sh  02
Feb

改为case 语句:

[oracle@jhoa 6]$ cat case.sh 
var="$1"
case $var in 
01)
echo "Jan"
;;
02)
echo "Feb"
;;
03)
echo "Mar"
;;
04)
echo "Apr"
;;
esac
[oracle@jhoa 6]$ sh ./case.sh 04
Apr