In Emacs how can I search a directory and all subdirectories for a filename?

Solution 1:

You can use M-x find-name-dired. It will ask for a directory and a wildcard pattern, so you can enter something like *thing* and have all files with "thing" in the name listed in a dired buffer.

More here: http://emacswiki.org/emacs/RecursiveGrep (along with a snippet that lets you skip writing out the stars too).

Solution 2:

In dired, you can list all the subdirectories of the visited directory by moving to the first line and pressing C-u l and adding the R switch. You can then search the file name in the buffer, or mark files based on a regexp with % m.

On Linux, or Windows with Cygwin utilities, or other unix-like system with GNU find, a quick-and-dirty hack is M-x grep-find, and edit the command line to contain just the find part with a suitable format:

find -type f -name '*.foo' -printf '%p:0:\n'

On any system that has unix tools available, you can run the find command with M-! find. In the output buffer, you can use M-x ffap to visit the chosen file. You can also set up dired-x so that C-u C-x C-f can be used instead of M-x ffap.