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Oh well. And I'm the idiot here, learning to program :-P

Thanks for the help everyone!

This worked (though I'm sure egrep would've been fine too):
if ! [[ `echo $1 | grep "^[0-9]*$"` ]]

Also, decided to put a counter in each of the improper argument tests so that I could stop the...

For the first two:
Input:
./math 3 p sd
Output:
Result is 3

With case it gives:
./math: Bad left number "3"
./math: Bad right number "sd"
Result is 3

Whoa, I have no idea what that means. Can you please explain the logic behind this? I'll try it now though.

Neither of those cures my problem. It still reads non numbers as zero.

I'm trying to write a bash script to perform basic arithmetic operations but I want to run a comparison on the arguments first to check that they're a number greater than zero.

I want an error to...