2.1 greater among three or two numbers

# Maximum of two numbers
echo enter two numbers with spaces
read a b
if [ $a -eq $b ]
    then
    echo both are equal
elif [ $a -gt $b ]
    then
    echo $a is greater
else
    echo $b is greater
fi

# Maximum of three numbers
echo enter three numbers with spaces
read a b c
if [ $a -eq $b -a $b -eq $c ]
    then
    echo all three are equal
elif [ $a -gt $b -a $a -gt $c ]
    then
    echo $a is greater
elif [ $b -gt $a -a $b -gt $c ]
    then
    echo $b is greater
else
    echo $c is greater
fi