How to do a logical OR operation in shell scripting

Question

I am trying to do a simple condition check, but it doesn\'t seem to work.

If $# is equal to 0 or is greater than 1 then say he

Answer 1

If a bash script

If [[ $input -gt number  ||  $input  -lt number  ]]
then 
    echo .........
else
    echo .........

fi

exit