FACTORIAL OF GIVEN NUMBER

SOURCE CODE:
echo " Enter the number for which factorial is to be found "
read n
f=1
a=0
i=1
if [ $n -eq $a ]
then
echo $f
else
while [ $i -le $n ]
do
f=`expr $f \* $i`
i=`expr $i + 1`
done
fi
echo " The factorial of the number is "
echo $f

OUTPUT:
[examuser35@localhost Jebastin]$sh fact.sh
Enter the number for which factorial is to be found
5
The factorial of the number is
120
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