Actually, I missed that in the File::Find example. In fact either the Perl test (and some others) is invalid or the shell test (and some others) is.
The shell script compiles recursively, and the Perl has a check to avoid compiling recursively. One of them violates the goal of the script

As far as the exit stuff goes, I realized that it could be written better as:

exit !-e "/etc/mtab"
[download]

I emailed the author with the exit changes (and reiterated your File::Find findings). Hopefully he will resolve them.

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