The most simple interface to the FATMEN system is the command line interface, or shell. After activating this shell, the user can enter Unix-like commands, such as ls, cd, pwd, mv, rm, cp etc. In addition, there are commands to add new file names to the catalogue (add/disk and add/tape) and to access existing data (find) or create new data (make). Using the ls command, users can display information about their files, such as date and time catalogued, owner, file format and user comment string.