echo enter first number
read a
echo enter second number
read b
echo enter third number
read c
if [ $a -eq $b -a $b -eq $c ]
then
echo all numbers are equal
exit
fi
if [ $a -lt $b ]
then
s1=$a
s2=$b
else
s1=$b
s2=$a
fi
if [ $s1 -gt $c ]
then
s2=$s1
s1=$c
fi
echo "smallest number is " $s1