I want to write some generic instructions on how to find the package that installs a particular file (the exact context is TeX packages: find the package in the Unix distribution that contains a particular TeX package). I might not know the precise path but will know the exact file name.
Ubuntu has the package search facility which allows me to do precisely this: search for the packages containing a particular file.
Which other Unix distributions have the same online search capability, and where are they?
(I found a few related questions, but none seemed to give the answer I'm looking for (though my search skills are distinctly poor, I freely admit). In particular, I couldn't get the method described by What is the Fedora equivalent to the Debian/Ubuntu package search pages? to work for, say,