Factorial in Bash

Welcome to the Factorial in Bash page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

#!/bin/bash

number=$1

if [[ -z "$number" ]]
then
	echo "Usage: please input a non-negative integer"
	exit 1
fi

if ! [[ "$number" =~ ^[0-9]+$ ]]  
then 
        echo "Usage: please input a non-negative integer"
        exit 1
fi

value=1

while [ $number -gt 1 ]
do

  value=$((value * number))
 
  number=$((number - 1))

done

echo $value

Factorial in Bash was written by:

• Amanda Hager Lopes de Andrade Katz

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

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How to Run the Solution

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