To remove a repository we do it manually by removing the row we have added in /etc/apt/sources.list or deleting the file from /etc/apt/sources.list.d. But we can also take advantage of add-apt-repository by adding --remove so in the example above we would have to write the following to remove the existing repository:
$ sudo add-apt-repository --remove 'deb http://archive.getdeb.net/ubuntu wily-getdeb games'.
But I've seen some people write -r instead of --remove and I assume they do the same thing?
But I also know that the r flag read all files under each directory, recursively so I wonder what the case would be here. Should you use -r or --remove?