Find GCD of the given three numbers using shell programming

Hope you get good knowledge how to find maximum among three number. Now we will use that concept to solve this problem. Here I submit a sample shell program which can solve our problem.

echo "Enter Number 1:-"
read a

echo "Enter Number 2:-"
read b

echo "Enter Number 3:-"
read c

gcd=1

if [ $a -ge $b ]
then
s=$a
else
s=$b
fi

if [ $s -ge $c ]
then
t=$s
else
t=$c
fi

i=1
while [ $i -le $t ]
do
d=`expr $a % $i`
e=`expr $b % $i`
f=`expr $c % $i`

if [ $d -eq 0 -a $e -eq 0 -a $f -eq 0 ]
then
gcd=$i
fi
i=`expr $i + 1`
done

echo "The GCD of $a,$b and $c is $gcd"

Now write the above code in any text editor and run it.
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