#!/bin/bash
#
# Usage: math n1 op n2
#

case $2 in
+)      echo "Addition requested."
        echo "$1 + $3 = `expr $1 + $3`" ;;
-)      echo "Substraction requested."
        echo "$1 - $3 = `expr $1 - $3`" ;;
\*)     echo "Multiplication requested."
        echo "$1 * $3 = `expr $1 \* $3`" ;;
/)      echo "Division requested."
        echo "$1 / $3 = `expr $1 / $3`" ;;
%)      echo "Modulo arithmetic requested."
        echo "$1 % $3 = `expr $1 % $3`" ;;
*)      echo "Unknown operation specified." ;;
esac

