Justin Shore replied to Sean Straw,
| Many thanks for the response. I think I understand what's
| going on in these two recipes. I like the latter one personally
| because I see if does file locking. The first one, I'm not so sure
| on. Does "mailbox" get locked when STDOUT is directed to it?
Yes, if stdout is *appended* to it and you have the second colon on the flag
line.
When the action is a pipe with an appending redirector (a ">>"), and you use
a second colon to request a local lockfile but you don't supply a name for
the local lockfile, procmail uses the first word after the ">>" and adds
$LOCKEXT (which is generally ".lock") to it to infer a name for the local
lockfile.
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