I'm trying to get the program I'm working on to distinguish the difference between a number and a non-number. I'm told that it is a situation where I would use the "greater than" qualifier... but how can a word or a series of numbers and letters (like a serial code) be greater or less than an actual number? any help would be much appreciated. 
Here is one for
distinguish between a number and a non-number
Look at this post - ksh : find value type
vino