Linux command Help information acquisition and division of Man manual chapters

Linux command Help information get
Built-in commands: #help command
External command:
(1) command to use Help with a brief format
#COMMAND--help
(2) using the Help Manual (manual)
#man CHAPTER COMMAND
(3) Info COMMAND
Get the online documentation for the command
(4) Many applications will bring their own Help documentation:/usr/share/doc/app-version
README: Information related to the program
Install: Installation Help
Changes: Changes in version iterations;
5) Official documents of the mainstream distribution
Http://www.redhat.com/doc
(6) Official documentation of the program
"Document" on the official site
(7) Search engine
Google

Division of the Man Handbook Chapter
The manual is divided into man1-man8.
Man1: Instructions or executables that the consumer can manipulate in the shell
MAN2: System call;
MAN3:C library call;
MAN4: Equipment files and special files, usually in/dev files;
MAN5: File format: (configuration file format);
MAN6: Game use help;
MAN7: Conventions and agreements, such as Linux file systems, network protocols, ASCII code, and other descriptions;
MAN8: Management tools and guardian;
MAN9: Documents related to Kernel

Help Manual path:/usr/share/man
Syntax format: #man COMMAND

Linux command Help information acquisition and division of Man manual chapters