Describes what different floppy disk formats look like. Under Linux, also contains information about swap areas used automatically by swapon -a . Usually contains a short description or welcoming message to the system. The contents are up to the system administrator. The message of the day , automatically output after a successful login.
Contents are up to the system administrator.
Often used for getting information to every user, such as warnings about planned downtimes. This makes it harder to crack passwords. Files executed at login or startup time by the Bourne or C shells. These allow the system administrator to set global defaults for all users. See the manual pages for the respective shells.