Reading info from an active file

[Keith Nation]

I have a program that writes a log file as it is running to give status of
the job.  I would like to read that file, pull certain lines of text from
it, and write to a new file.  Because I am such a novice user, I was hoping
someone had covered this before and could let me know of your methods.  If I
open and close the file repeatedly to get refreshed information, I assume it
would slow the system down.  Any thoughts?

Keith Nation
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