Summary three: Linux get command Help

Summary three: Linux get command Help

One, command type view

Usage: type COMMAND

Second, Shell built-in commands

usage:helpCOMMAND

Third, external command

1 , get brief help information

usage:COMMAND--help

2 , get detailed help information ( user manual )

usage:manCOMMAND

Mans is actually Manual ( manual ) the abbreviation for one of its file paths: /usr/share/man/

(1). explanation of the paragraph name in the manual

NAME : Command name

DESCRIPTION : A detailed description of the command function

OPTIONS : All options

Synopsis : Using formatting

EXAMPLES : Using the example

FILES : The configuration file associated with the current command

See ALSO : Other manuals available for reference

(2). the format string in the manual:

[]: can be omitted

<> : cannot be omitted

                     | : Two Select one or more

                     ... : Similar content can appear in multiple

{a|b} : a or b Choose a

(3). Man tips for using:

Flip Screen:

SPACEBAR : Flip a screen to the end of a file

b : Flip a screen to the file header

Enter: Flip a line to the end of the file

k : Flip a line to the file header

Ctrl+d : Turn half screen at the end of the file

Ctrl+u : Turn half screen to file header

String Search:

/keyword : Search from the file header to the tail

? keyword : Search from the end of the file

N : Shows the next found

N : Displays the last found

exit:Q

(4). Man Manual Chapters

Mans Can provide help manuals for configuration files other than commands, system calls, library calls, and so on, in separate chapters:

1 : User Commands

2 : System Call

3 : library Call

4 : Device file Format

5 : Configuration file

6 : Game

7 : Miscellaneous

8 : Manage Commands

Usage: Man [#] COMMAND # represent numbers

Attention:

How to see which chapters of a specified command are helpful, use the whatis command

usage:whatis COMMAND

Whatis A lookup operation is performed based on the database, which is updated periodically for the system; Makewhatis Manual Update.

3 , get online documentation

Usage:info COMMAND

generally only in Mans Manual is not available for sufficient information or to understand the development history of the program Info .

4 , many applications have their own Help documentation: /usr/share/doc/

ChangeLog : Changes in program version upgrades

INSTALL : Installation Method Description

README : Program Description Information

5 , view official documentation for the mainstream release, such as RedHat wait

document URL --redhat:http://www.redhat.com/docs/

6 , Inquire Google great God, most problems can be solved.

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Summary three: Linux get command Help