.1 File Extension

Manual page (or "man page") used by the Man utility, a Unix program used to view user manuals; contains plain text documentation, separated into several segments delimited by standard markers; used for storing a level 1 user manual.

Level 1 user manuals describe general commands for the Unix operating system. They are stored in files that contain the name of the command followed by the ".1" extension. For example, a manual for the command "cmd_example" would have the filename "cmd_example.1."

Since unix man pages are stored in a plain text format, they can be created and edited with any text editor.

NOTE: 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.