Shell Script To Simulate a Simple Calculator

#!/bin/bash


# Shell Program to simulate a simple calculator


# --------------------------------------------------------------------


# This is a free shell script under GNU GPL version 2.0 or above


# Copyright (C) 2005 nixCraft project.


# Feedback/comment/suggestions : http://cyberciti.biz/fb/


# -------------------------------------------------------------------------


# This script is part of nixCraft shell script collection (NSSC)


# Visit http://bash.cyberciti.biz/ for more information.


# -------------------------------------------------------------------------


 


a=$1


op="$2"


b=$3


 


if [ $# -lt 3 ]


then


 echo "$0 num1  opr num2"


 echo "opr can be +, -, / , x"


 exit 1


fi


 


case "$op" in


 +) echo $(( $a + $b ));;


 -) echo $(( $a - $b ));;


 /) echo $(( $a / $b ));;


 x) echo $(( $a * $b ));;


 *) echo "Error ";;


esac