Question

Write a shell script that given a radius, calculates the area of a circle. (Hint – don’t write this from scratch. Find another script that reads user input and performs a calculation, then modify it to meet your needs.) Save the script in your home directory with the name circle.sh

The formula for calculating the area is:

Area=Π*Radius2

You can use 3.14 for Π, and either do Radius*Radius or Radius^2 to get the square of the radius.

Use the scale command to limit the number of decimal points for the area, but do at least two places after the decimal.

You can assume that the user will enter numbers, so you don’t have to do any error checking of the input.

Your program should allow the user to enter the value for the radius, perform the calculation(s), and then print the output. The output should be a circle that is labeled appropriately.

Answer 1

Bash Script:

#!/bin/bash

# Reading radius from user
read -p 'Enter Circle Radius: ' radius

# Calculating area
area=$(echo "scale=2; (3.14*$radius*$radius)"| bc)

# Printing area
echo "Area of Circle: $area"

____________________________________________________________________________________________________

Sample Run:

anil@ubuntu: /student17$ ./circle.sh Enter Circle Radius: 4.5 Area of Circle: 63.58 anil@ubuntu: /student17$