Help for Linux basic 4 commands

Getting commands to use helps with several methods:

1. Help ' CMD '----internal command
2. ' CMD '--help----external command

3, man ' cmd '---view CMD command manual

#whatis ' cmd ' to see which sections of CMD are in the Man manual;

Chapter categories of the Man Handbook:

1. User command (/bin,/usr/bin,/usr/local/bin)

2. System call

3. Library users

4. Special documents (equipment files)

5. Configuration file Format (syntax)

6. Games

7. Miscellaneous

8. Management Order (/sbin,/usr/sbin,/usr/local/sbin)

The paragraph of the Man Handbook:

1. Name

2. Synopsis: Grammar

Some of the rules about grammar:

<> must-Choose

[] Optional

... The contents before this symbol can be multi-selected

| Choose one more (or)

{} grouping, framing scope

3, Description: Description

4. Option: Explain the meaning of each option

5. Files: The relevant configuration file for this command

6, Bugs

7, example

8. See also: another reference
Man manual screen, search and other functions: the same as the VI.

4. Info ' CMD '-----check online documentation

5./usr/share/doc----Documents

Help for Linux basic 4 commands