The notation is meant to tell you which man section those commands are described in. The section is in parentheses, and the word can refer to a program, a built-in command, a file, or sometimes a looser concept.
You have a library of man pages, divided into sections.
For instance, the restriced system administration commands
are in the 1M section. Those commands are described in the
intro(1M) man page, and the programs are stored in /usr/sbin.
To read the intro(1M) man page, type this:
man 1M intro
The section names, like 1M, 2, 3, 3S, 4, 4tcp, etc., are case
sensative. Be sure to watch that when using man.
To read the intro(4tcp) page, you'd type:
man 4tcp intro
The reason you'd use the section names, rather than just typing
man intro, would be your desire to specify which of the many "intro"
pages you want to retrieve. As another example, there are two passwd
man pages, passwd(1) and passwd(4).
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