How to use genstrings across multiple directories?

I don't know exactly why, but Brian's command didn't work for me. This did:

find . -name \*.m | xargs genstrings -o en.lproj

EDIT: Well, when I originally wrote this I was in a hurry and just needed something that worked. The issue that was occurring for me when using the accepted answer above was that "*.m" has to be quoted (and the curious can find an explanation as to why this is the case in the comments on Brian King's answer). I think that the best solution is to use that original answer with the appropriate bit quoted, which would then read:

find ./ -name "*.m" -print0 | xargs -0 genstrings -o en.lproj

I'm leaving my original reply intact above though, in case it still helps anybody for whatever reason.

One method would be:

find ./ -name "*.m" -print0 | xargs -0 genstrings -o en.lproj

xargs is a nice chunk of shell-foo. It will take strings on standard in and convert them into arguments for the next function. This will populate your genstrings command with every .m file beneath the current directory.

This answer handels spaces in the used path so it is more robust. You should use it to avoid skipping files when processing your source files.

Edit: as said in the comments and in other answers, *.m should be quoted.

Not sure if anyone noticed it or the option came later on, but now there is an -a option is genstrings. None of the above options worked for me. Below is my solution.

find ./ -name "*.m" -exec echo {} \; -exec genstrings -a -o en.lproj {} \;

This will also print the name of the files read.

Though above command works fine, it was not exactly for me, because in my project folder there are many files which are lying in folder but not included in xcode project. So what I did was, created a list of files used in my project by parsing pbxproj file. Added the list in filelist.txt, and fired below command

while read f; do find ./ -name "$f" -exec echo {} \; -exec genstrings -a -o en.lproj {} \; ; done < filelist.txt

This works for me:

find ./ -name \*.m -print0 | xargs -0 genstrings -o en.lproj

Thanks to Brian and Uberhamster.