Shell Script to Perform Arithmetic Operations

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.