If you've ever worked on an unfamiliar Apache installation you know how it is trying to follow all the includes (which may in turn include more files) to track down the source of a mysterious rewrite rule or LocationMatch. So I wrote acuff. It searches for an Apache executable in your $PATH and typical locations like /usr/local/apache2/bin and spits out its config filenames (with full paths) to standard output. My typical usage goes something like this:

% acuff | xargs grep -il '<location /logout'
/usr/local/etc/apache22/conf/app.conf

It's in Perl, and anything running Apache is bound to have Perl on it. It uses no extra CPAN modules but it does need Perl 5 (this being 2008 it's completely reasonable to ignore Perl 4 and earlier, I hope). Enjoy.

October 5, 2009 update: acuff is now part of my "futilities" collection on github.