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Assumption here is that whenever port goes from unserviced to serviced that your script should be run. This script should be started in the background with nohup (perhaps from /etc/init.d):

while...

draghun9,
How you have coded the RCODE above will not work (try it). If you want to code this into a function, then why try to do in all one command line? Use an If/else condition to echo the return...

Assuming nothing more than that the data is a valid text file, while the following traps may not trigger often, I think it's a good idea to mention them for the benefit of novices considering adding...

Awk doesn't mysteriously stop working inside while loops, no.

I can only guess what your friend meant, but I'm assuming the lesson intended was "Don't run awk 30,000 times to process 10,000...