A couple of options:
- set up a cron job to scan the directory for files or new files and fire off the perl parsing script. This is the most wasteful option because it polls, but is most likely to be supported on your system.
- Install tripwire. You may be subject to licensing fees, but this will most definitely get the job done.
- Hack/modify/add a hook to the FTP server to fire off the perl script whenever a file is put into a specific directory. If the FTP server is used for nothing but this uploading thang (sic), then use some CPAN modules to throw together your own FTP server or modify a Perl FTP server that you find online. This is the least secure of your options- that is, if you're not pedantic about your UN*X programming.
It looks like Option #2 is the winner!
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