Simple Interest Calculation : Shell Script for Mac OS X

Guys, today we'll look into a very basic simple shell script to calculate the Simple Interest. For this we need 3 essential details :

Principal Amount
Rate of Interest
Period i.e No. of years

Here's the bash script to calculate the Simple Interest.

#!/bin/bash

#program to calculate simple interest

echo "================================"

echo "Simple Interest Calculation Tool"

echo "================================"

echo "Enter principal amount : "

read principal

echo "Enter Rate of Interest : "

read roi;

echo "Enter No. of years : "

read years;

simple_interest=`expr "($principal*$years*$roi)/100"|bc`

echo "Simple Interest = $simple_interest"

Output :

./SimpleInterest.sh

================================

Simple Interest Calculation Tool

================================

Enter principal amount : 

5000

Enter Rate of Interest : 

9.5

Enter No. of years : 

5

Simple Interest = 2375

If you note, we have used the bc command to evaluate our expression i.e the Simple Interest formula. More on bc can be read here.