Factorial of a Number [Shell Program]

echo "Enter a
number"

read n

f=1

if [ $n -eq 0 ]

then

echo "Factorial
is: 1"

else

while [ $n -ge 1 ]

do

f=`expr $f \*
$n`

n=`expr $n - 1`

done

echo "Factorial
is:"$f

fi