Write a shell script to calculate factorial of a given number

Write a shell script to calculate factorial of a given number

Script:

echo "Enter a number"

read num

fact=1

while [ $num -gt 1 ]

do

  fact=$((fact * num))  #fact = fact * num

  num=$((num - 1))      #num = num - 1

done

echo $fact

Output:

[root@localhost shell_script]# bash factorial.sh

Enter a number

3

6