Question

1. Name the script while.sh.
2. Ask the user to enter a positive integer. You can assume that the user will enter a positive integer (input validation for a positive number not required).
3. Use a while loop to print all integers from 0 up to and including the integer entered. Each integer should be printed on a line by itself and nothing else should print.

This is for Linux. I have not done anything on this script. Please help with simplistic commands as this is a beginner's class.

Answer 1

Hi,

The lines starting with '#' are comments for shell script.

For creation use the below command :

vi while.sh

For executing the script, we need to provide execution permission to the script as uder.

chmod +x while.sh

For running the script

./while.sh

Please find below :

while.sh

#!/bin/sh
#The initial value is defined
i=0
#Command prompting user to input a positive number.
#The number entered by the user is defined in a variable num.
read -p "Enter a positive number : " num
#while loop to print all the numbers between the initial variable i to the positive number entered.
while [ $i -le $num ]
do
#Command to print all the numbers
echo $i
i=`expr $i + 1`
done

Screenshot

Output

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