Do you want to perform easily search-replace in multiple files and file rename in one go ? This utility allows you to group all your files in one giant file (like tar) but editor friendly. The archive file is in fact a shell script regenerating the full tree structure. You can then use your favorite editor to edit it and do the required modifications (rename variables, class names, files, directories).
The giant file is in fact a shell script which generates all the needed file. Just run it preferably in a empty directory.