Write shell script, using case statement to perform basic math operation as follows : + Addition - Substraction / Division x Multiplication.

Write shell script, using case statement to perform basic math operation

 as follows :

 + Addition

 - Substraction

 / Division

 x Multiplication.

script:-

if [ $# -eq 3 ]

  then

       case $2 in

         +)   let z=$1+$3;;

         -)   let z=$1-$3;;

         /)   let z=$1/$3;;

         x|X) let z=$1*$3;;

         *)   echo "Warning: $2 invalid operator, only +, -, x, / operator"\

                     " allowed."

              exit;;

       esac

       echo "Answer is $z"

else

       echo "Usage: $0 value1 operator value2"

       echo "         Where, value1 and value2 are numeric values"

       echo "                operator: +, -, /, x (multiplication)"

                       fi