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The difference is the login session: in one case it originated from a terminal ("pts/<n>" is a terminal), in the other case it is from a network line. Only the latter carries an IP address because...

I've seen this happen before, but never discovered why. If you just need the IP Address that current user running the script connected from and they connected via ssh, you can get it from the...

To be honest i don't quite get it. Actually this is the case in your proposed solution, not in mine: just because i denominate it "DEST" in the file as well as in the variables name doesn't mean they...

The answer is to use "eval" but the reason is not easy to explain. I'll give it a try:

The shell evaluates commandlines on a fixed step-by-step basis. For instance you rely implicitly on this...