Open MAN File
A MAN extension file is a help manual used by the Unix Man utility, a program used to view operating system documentation.
Unix is an operating system developed in the 70s, whose main technical characteristics are: its portability, its multi-user and multi-tasking capacity and its efficiency.
Also Unix is known for its high security and good performance in network tasks.
But Unix is a philosophy that has minimalism and modularity as its principles: making programs that do one thing well done and that, by communicating with each other, execute more complex tasks.
The MAN file contains information about a Unix command or other Unix function and can be viewed from within a shell using the man command.
Unix man pages use extensions 1 through 8 for user manuals, and rarely use the MAN extension.
MAN page file names contain the command (or topic name) followed by the section number.
MAN pages can be viewed by typing man [section] [page], where [section] is the section of the MAN page, and [page] is the name of the user manual.
Since MAN pages are stored in plain text format, they can be created and edited with any text editor.