Is there a way to test for a plain file's existence with procmail internals?
Failing that, on a system where /bin/test is a shell script, what would you
folks recommend as a small, cheap-to-run fork that (1) can take a filename as
a positional parameter [so that there's no need to fork a shell to handle
"<"], (2) will exit with an error if the file doesn't exist. and (3) will not
read the whole blasted file if it does exist and is long. The best I can
think of is head -0.
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