Factorial a Number in Bash

 I wrote this simple bash script to ask the user to give a number and then the program will compute the factorial value of the given number.

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Program Listing

factorial.sh

#!/bin/bash

#Factorial a Number in Bash  

#Mr. Jake Rodriguez Pomperada,MAED-IT,MIT

#Bacolod City, Negros Occidental Philippines

printf  "\n\n"

printf  "\tFactorial a Number in Bash"

printf  "\n\n"

printf  "\tGive a Number : " 

read num

factorial=1

for((i=2;i<=num;i++))

{

  factorial=$((factorial * i))  #factorial = factorial * i

}

printf  "\n"

printf  "\tThe factorial value of $num is $factorial."

printf  "\n\n"       

printf  "\tEnd of Program"

printf  "\n\n"