monitor unix file for string

Hello,

I have a requirement to monitor a log file in unix using perl 5.8.
Needed is detection of "error" in a line appended to the file.
Also need to detect if "complete" is not found after, say, 5 hours
after invocation.

I expect there is a hard way and an easy way to do this - could some
kind person advise me?
Pointers to Fine Perldocs welcome!

TIA

JJ

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