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rm logfile.5 mv logfile.4 logfile.5 ... cp logfile logfile.1 cat /dev/null > logfile
Always Always on Perls where it is no longer experimental Sometimes, such as when I deem the syntax to be clearer with it than without Only if the existing code base uses it or a standards doc mandates it Arbitrarily/Randomly Never Never heard of it I'm still supporting 5.6.0, you insensitive clod!
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