Certain files in the operating system are required to have a specific format. The formats of the files that are provided with the operating system are discussed in the documentation for those files. If a file is generated by either the system or a user rather than provided on the distribution medium, it is discussed as a file format in this documentation. File formats often are also associated with header files that contain C-language definitions and structures for the files.
More information about the following file formats is provided in this
documentation:
| acct | Describes the format of the records in the system accounting files. |
| a.out | Describes the structure of the standard a.out file and its associated header files. |
| ar | Describes the format of an archive file. |
| audit | Describes values used by the auditing system as well as the structure of a bin. |
| bootptab | Describes the default configuration database for the Internet Boot Protocol server (bootpd). |
| CGM | Defines a file format for storage and retrieval of device-independent graphics. |
| charmap | Defines character symbols as character encodings. |
| core | Describes the structures created in a core file as a result of a core dump. |
| cpio | Describes the cpio (copy in/out) archive file. |
| eqnchar | Contains special character definitions for the eqn and neqn commands. |
| lastlog | Defines the last login attributes for users. |
| locale definition | Contains one or more categories that describe a locale. |
| locale method | Specifies the methods to be overridden when constructing a locale. |
| magic | Defines file types. |
| mailrc | Sets defaults for the mail command. |
| mh_alias | Defines aliases for the Message Handler (MH). |
| mib_defs | Provides descriptions of Management Information Base (MIB) variables for the snmpinfo command. |
| nroff and troff input | Specifies input file format for the nroff and troff commands. |
| nterm | Describes the format of the terminal driver tables for the nroff command. |
| profile | Describes the format of the profile and .profile files, which set the user environment at login time. |
| queuedefs | Describes the format of the file used by the cron daemon to handle event types. |
| sccsfile | Describes the format of a Source Code Control System (SCCS) file. |
| setmaps | Defines the text of a code-set map file and a terminal map file. |
| terminfo | Contains compiled terminfo source files. |
| TIFF | Enables InfoCrafter to support scanned images that have been imported into Interleaf documents. |
| trcfmt | Stores trace templates. |
| troff | Describes the output language of the troff command. |
| troff Font | Describes the format of the troff command font files. |
| UIL | Contains information on the user interface for a widget-based application. |
| utmp, wtmp, failedlogin | Describes the format of the user and accounting information in the utmp, wtmp, and failedlogin files. |
| vgrindefs | Contains the language definition database for the vgrind command. |
| WML | Generates variable UIL compiler components. |