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Not only did ErV provide you a solid algorithm, I actually wrote out a [rather inefficient] script for you!
What's more, this is not a bad forum for a beginner, but this is a bad forum for a lazy beginner. You have shown absolutely no effort in your trials to get help, henceforth no one is providing much in the way of effort to help you.
I found a easy understandable solution for you. You can check this.
echo "Enter Number 1:-"
echo "Enter Number 2:-"
echo "Enter Number 3:-"
if [ $a -ge $b ]
if [ $s -ge $c ]
while [ $i -le $t ]
d=`expr $a % $i`
e=`expr $b % $i`
f=`expr $c % $i`
if [ $d -eq 0 -a $e -eq 0 -a $f -eq 0 ]
i=`expr $i + 1`
echo "The GCD of $a,$b and $c is $gcd"