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From: Francesco Potorti` <pot@gnu.org>
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Subject: Re: recursing through directories
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   Not really, unfortunately.  ftw is standard, but it's a portability
   hassle too.  In practice, there are real problems in running out of
   file descriptors when descending into deeply nested directories.

Do you mean that there is an open file descriptor per directory level?

   You might try taking a look at lib/savedir.[ch] from the GNU core
   utilities, written by David MacKenzie.

I'll do that.  Thanks to all for your advice.