Resource fork files on Mac OS X isn’t something new. It’s been there way back from the old Mac operating system versions. These are files that starts its name with a ‘._’ followed by the original name of the file. It becomes a nuisance dealing with them when you have to copy files from a Mac to some other operating system like Ubuntu or Windows.
The problem becomes particularly evident when you want to backup files using the tar program on Mac OS X and you find out that using the exclude option doesn’t want to follow your request to stop copying those resource fork files.