By default, when a file is initially checked-in (see section on checking-in), the respective version file (see section on version files) is placed in the same directory as the file. To avoid cluttering the directory, an RCS subdirectory can be created to collect the RCS files. If the subdirectory already exists, RCS will store all RCS files there rather than in the same directory as the working file (see section on working file).

Create an RCS subdirectory with the following command:

$ mkdir RCS