#Linux学习笔记 # Linux online Help document Man page

Man is the abbreviation for manual, which represents the manual page. the Help manual page for the Linux system is stored in sections . The Man manual page is divided into the following chapters.

1 General Commands

2 system calls provided by the kernel

3 Library Calls (C library functions)

4 special files (mostly in the/ dev directory) and devices

5 File format specification

6 games

7 Miscellaneous (and its specifications)

8 system administration commands (usually root privileges required) and daemons

the Linux system displays only a section of the Man manual page. Use the man command to open the Man manual page to specify the chapter number to open, such as the following command to open passwd 5 Chapter Content,

Mans 5 passwd

The contents of the file /etc/passwd, not the command passwd, are displayed. If no chapters are specified , the man command will be looked up in the following chapter lookup order:

1 8 3 2 5 4 9 6 7

Displays the first found chapter content, even if there are multiple chapters (we can, of course, modify the section in the /etc/manpath.config configuration file Options to customize the order in which chapters are found).

In addition, with the whatis command, we can display only The brief information of the required Man manual page. If you simply want to get a brief description of the command LS , use the following command:

Ls

Then you get the output: "list directory contents. "(" Column directory Contents ").

Man manual format:

All man manual pages are organized in the following standard formats:

Name- The manual describes the object names, and a brief description.

Synopsis- Command parameter format, or function call format.

DESCRIPTION- A more detailed description of the narrative object.

EXAMPLES- An example of the use of the digest.

OPTIONS- The meaning of the command line or function call parameter.

Exit STATUS- The meaning of the different return (exit) codes.

Files- documents related to the narrative object.

BUGS- a known bug.

See ALSO- related content list.

AUTHOR, history, copyright, LICENSE, WARRANTY- historical, copyright, editorial information.

Search Man page:

What if we do not know the name of the manual to be consulted? It doesn't matter, we can use the- k or --apropos option to search the relevant manual for a given keyword. For example, to check the manual for the password ("password"):

Keyword search features are generated from a dedicated cache. If you do not have this cache by default, you washes generate this cache by using the following command:

$ mandb

Each time you install a new manpage , you need to run this command before the cache is updated.

Now you can start the search. For example, to check the manual for the password ("password"):

 man-k password

Or:

Mans --apropos password

You can also use the apropos command directly:

$ apropos Password

Keywords can use regular expressions.

Man Display page action ( same as less command)

Cursor Movement Action:

Action commands	Function description
E,^e, J, ^n	Forward line (or N line , for example, first enter 2 and then enter e to forward 2 lines )
Y,^y, K, ^k, ^p	Back row (or N row , Ibid.)
F,^f, ^v, SPACE	Forward a window (or N - line , IBID.)
b,^b, esc-v	Back one window (or N rows , IBID.)
Z	Forward a window
W	Back a window
Esc-space	Forward a window that does not stop at the end of the file
D,^d	Forward half a window
U,^u	Back Half window
esc-), RightArrow	Left Half screen width
esc-(, Leftarrow	Right Half screen width

Find an operation:

Action commands	Function description
/pattern	Look forward to the line that contains the pattern .
? pattern	Finds the line that contains the pattern backwards .
N	Finds the next pattern line .
N	Finds the previous pattern line .
Esc-n	Same as N.
Esc-n	Same N
Esc-u	Cancel highlighting of all searches

Jump Action:

Action commands	Function description
P,%	Jump to the beginning of the file
G,<	Jump to the first line of the file
G,>	Jump to the last line of the file

For A more detailed description of man, please use the command

$manMans

Reference:

Uncle Bird's private cuisine: http://vbird.dic.ksu.edu.tw/linux_basic/0160startlinux_3.php

ArchLinux man page(English)

Wiki: Https://en.wikipedia.org/wiki/Man_page#Repositories_of_manual_pages

#Linux学习笔记 # Linux online Help document Man page