path-name would name a command which would be invoked by sortm. It would be
given 2 arguments, full path names of messages.
Are you suggesting that it be fork()ed and exec()d for each message (as
opposed to have a long-running program that gets executed just once per
sorm invocation)? If so, it occurs to me that it would be simpler to
just make the > < decision based on the exit code of the process.
--Ken
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