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Script to find Overlapping Time

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Hi,
I would like to create "time.sh" script that will be run upon exiting file. In the file each entry has a start time and an end time. I would like the script to check to see if any other entry items fall on top of one another? I imagine this would be some type of looping script, but I've got no idea where to start with this one.

example file:
sec_1 10:00 11:12
sec_2 11:23 12:12
sec_3 13:00 23:49
sec_4 16:00 19:00

please give the strat for this problem.
Nov 28 '07 #1
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