How do I get Linux command help?

Get command Use Help:

Internal command: Help command

External command: Command--help (most commands have the Help option)

Command manual: Manual

Man [chapter number] COMMAND

Where the man database is divided into chapters, the same command appears in different chapters representing different meanings.

You can use the Whatis command to see what chapters of the command are present in the man.

A total of 8 chapters:

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

2: System call

3: library Call

4: Special documents (equipment files, etc.)

5: File format (the syntax of the configuration file, such as the meaning of each part separated by a colon in/etc/passwd)

6: Game

7: Miscellaneous (Miscellaneous) (poorly categorized content)

8: System command (/sbin,/usr/sbin,/usr/local/sbin, etc.)

Show command format in man:

<>: Indicates the content that must be given, such as options, parameters, etc.

[]: Indicates an optional

... : Indicates that you can repeat

| : Choose one More

{}: Represents grouping

Man result fragment content:

Name: command names and features brief description

Synopsis: Usage notes, including available options

DESCRIPTION: A detailed description of the command function, which may include the meaning of each option

Option: Describe the meaning of each option

Files: The configuration file associated with this command

BUGS:

EXAMPLES: Using the example

See ALSO: Another reference

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How do I get Linux command help?