Display the Calendar [Shell Program]

clear

echo " Enter the
Year: \c"

read year

echo " Enter the
Month: \c"

read month

m=0

case "$month" in

1|jan) m=1;;

2|feb) m=2;;

3|mar) m=3;;

4|apr) m=4;;

5|may) m=5;;

6|jun) m=6;;

7|jul) m=7;;

8|aug) m=8;;

9|sep) m=9;;

10|oct) m=10;;

11|nov) m=11;;

12|dec) m=12;;

*) echo $month  "is not a valid Month! Showing
Calendar for " $year ;;

esac

if [ $m -ne 0 ]

then

cal $m $year

else

cal $year

fi