Linux shell script allows users to do the arithmetic operation with user input for the operations. In order to achieve this, we will be using a case statement.

vi airth.sh

#!/bin/bash

echo "enter a and b"
read a
read b
echo "enter operation to be performed"
read op
case $op in
+) c=`expr $a + $b` ;;
-) c=`expr $a - $b` ;;
/) c=`expr $a / $b` ;;
\*) c=`expr $a \* $b` ;;
*) echo "no valid operation specified" ;;
esac
echo Result after performing operation on a and b is
echo $c

Here is the sample output of the above script

More ways to use this case statement.

• You can use case to accept YES or NO, the same way software installation, during the license agreement.

• You can also use to find File type from the Extension.