How to use genstrings across multiple directories?

I have an directory, which has a lot of subdirectories. those subdirs sometimes even have subdirs. there are source files inside.

How could I use genstrings to go across all these dirs and subdirs?

Let's say I cd to my root dir in Terminal, and then I would type this:

genstrings -o en.lproj *.m

How could I tell it now to look into all these directories? Or would I have to add a lot of relative paths comma separated? how?

From stackoverflow

• One method would be:

  find ./ -name *.m | xargs 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.

• 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