Is there a utility that'll do this, or an easy way to script one? There is an old DOS utility (GLOBAL.EXE) that would recursively run a given command on every file in a directory.

I'm trying to use the Unix command "zip" to inject a file into all zip files in a directory (and its subdirectories). The command to do this for one file is:

zip stuff.zip addfile.txt

- results in addfile.txt being added to the contents of stuff.zip. This is fine, but I need to inject "addfile.txt" into all zipfiles in the directory tree! Any pointers?