.1 File Extension

Learn about .1 files and view a list of programs that open them.

Level 1 user manuals describe general commands for the Unix operating system. Each level 1 user manual is stored in a file that bears the same name as the command it describes, followed by the .1 extension. For example, a manual describing the cmd_example command has the filename cmd_example.1.

Unix man page files are commonly compressed into .GZ files and have the .gz.1 compound extension. Unix man pages also use the .2 through .8 extensions for other sections. For example, the .2 extension is used for system calls documentation.

Level 1 user manuals describe general commands for the Unix operating system. Each level 1 user manual is stored in a file that bears the same name as the command it describes, followed by the .1 extension. For example, a manual describing the cmd_example command has the filename cmd_example.1.

Unix man page files are commonly compressed into .GZ files and have the .gz.1 compound extension. Unix man pages also use the .2 through .8 extensions for other sections. For example, the .2 extension is used for system calls documentation.

You can open a 1 file with the man utility included with most Unix systems. Since Unix man pages are stored in a plain text format, you can also open them in any text editor, such as Vim (Linux, Mac), Microsoft Notepad (Windows), and Apple TextEdit (Mac).