read A
read B
if (($A > $B)); then
    echo X is greater than Y;
elif (($A < $B)); then   
    echo X is less than Y;
else
    echo X is equal to Y;
fi

read a 
read b 
(( a > b )) && echo "X is greater than Y  " && exit 0
(( a == b )) && echo "X is equal to Y   " && exit 0
(( a < b )) && echo "X is less than Y  " && exit 0

#!/usr/bin/bash

read X
read Y

# it is important to set the spaces between the numbers.
if [ $X -lt $Y ]; then
    echo "$X is less than $Y"
elif [ $X -gt $Y ]; then
    echo "$X is greater than $Y"
else
    echo "$X is equal to $Y"
fi

read X
read Y

if [[ ${X} -gt ${Y} ]]
then
    echo "X is greater than Y"
elif [[ ${X} -lt ${Y} ]]
then
    echo "X is less than Y"
else
    echo "X is equal to Y"
fi