I have a rule that collects the headers from mail and writes them to a
file.
I want to trim this file periodically by way of a perl script and cron
job.
But not sure how to guarantee that I'm not interfering with a write
coming from procmail, or allowing procmail to interfere with the perl
scripts rewrite of the file.
I thought to copy the file to a new name, do whatever operations to
shorten it under the new name, then move it back to the original name.
How can I guarantee that last move doesn't interfere with a write
happening at the same moment. Or will the underlying OS just do the
right thing? (It will be on a linux box).
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