[Shell Script][bash]Finding factorial of a given number using shell script

#!/bin/bash #This script will print the factorial of the number passed as arguement . eg:- ./factorial.sh 4 will print 4! value number=$1 factorial=1 i=$number while [[ $i != 1 && $i != 0 ]] do factorial=`expr $factorial \* $i` i=` expr $i – 1 ` done echo “Factorial of $number is $factorial”