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

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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.

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You can open: */foo.bar for finding any files named foo.bar in a direct subdirectory of the current one, or **/foo.barfor finding any files named foo.bar recursively in subdirectories of the current one.

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This doesn't work for me -- I suspect it requires some library that isn't loaded by default. – offby1 Oct 5 '12 at 20:27
    
It work here with stock Emacs (with emacs -q --no-site-file), I do know that this was not available with older Emacs, and it conflict with ido. – Rémi Oct 6 '12 at 11:30
    
You're right; it works for me, too. I never noticed that! – offby1 Oct 6 '12 at 17:44

In emacs 23, try M-x find-dired

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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).

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