Ha!
As it happens I'm actually working on cron in Perl for PPT.
I was planning on posting it to perlmonks when done to ask
for comments and optimizations...
A functional but not yet fully complete version is here:
http://web.mit.edu/belg4mit/Public/cron
UPDATE: it now lives at: http://pthbb.org/software/crond/
Of particular interest are the non-standard options -f and -X
-f allows you to specify a crontab in a non-standard location
Stuff to do:
security (setuid and setgid)
checking crontab update times and reloading as necessary
internal mailer (would be perfect for this, just set the crontab entry to cat a file...)
some other odds and ends
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