Is it possible to search for a particular filename on GitHub?

In my case, I wanted to search for a particular file name, in all of my organization's repositories. This can be done by entering this in the search box:

org:your-organization-user-name filename:the-file-name

Of course, just do "filename:the-file-name" if you want to search the whole of GitHub.

I didn't see this in https://help.github.com/articles/searching-code/ but found out when I switched context, and GitHub entered the filter for me automaticallly.

In search input, you can use filename parameter to search in multiple repositories, for example:

filename:my_filename.txt

If you're looking for a filename in specific repository, you can just press t and start typing the file name (see: GH keyboard shortcuts).

GitHub introduced FileFinder in 2011.

Try it out: just hit t on any repo's file or directory view.[1]

So, You're still restricted to repository.

[1]https://github.com/blog/793-introducing-the-file-finder

Another approach to Your question:

Can I use Git to search for matching filenames in a repository?

Does the search user.rb in:path do what you want to do? Alternatively there is also this search filename:user.rb

Found on: https://help.github.com/articles/searching-code/