See Feifei in detail how to quickly get Linux command help

Man Command Manual
Man Commond Open the Manual of the command, since it is the place where the manuals should be stored, usually compressed files
When you open a file with man, you usually have the following parts:

NAME AUTHOR DESCRIPTION OPTIONS reproting BUGS COPYRIGHT See ALSO EXAMPLES
For internal commands, when you're man, it's man's not built-in command and man's shell.
Export lang=en command to temporarily change the current character set
Man is divided into chapters in total 8: Mans 4 LS Specifies the chapter you want to view, otherwise it will execute each chapter sequentially
1 commands that all users can use to command (/bin,/usr/bin/,/usr/local/bin)
2 system Calls
3 library calls, only libraries have library calls
4 special files, such as: Device file, block device, character device, just as a access entry exists for man TTY
5 file format is used to show the role of a configuration file
6 games
7 Miscellaneous for inconvenience classification
8 Administrative commands are commands that administrators have permission to use (/sbin,/usr/sbin/,/usr/local/bin)
Whatis commond See which section of the command exists
[] Optional
..|  ...|.. Choose one More
<> must choose
.... You can use multiple
{} is used for grouping, no special meaning
Man
Name and function brief description of the command
Synopsis usage notes, including available options
A detailed description of the DESCRIPTION command function, which may include the meaning of each option
Files This command is related to the configuration file
BUGS Reporting Bugs
EXAMPLES Case Description Man Lvcreate
See ALSO: Another reference
Shortcut keys for man:
Turn Back one space
Turn forward a frequency B
Turn back one line to enter
Go ahead and turn the line K
Find: Default case insensitive
/keywords backwards when searching for more than one keyword
N Next keyword
N a keyword above
? Keywords forward
Exit Q
Info Gets the usage information of a command, mainly about the history of the command and the use of some commands, with not much pageup and PageDown to page
/usr/share/doc almost every command has a manual document here, which may be seen here later. Kernel-related documentation
Google has a problem directly to Google, Baidu sucks, it is the fact
Cal a simple calendar program that uses the following:
Cal 2012 2012 Calendar
Cal 12 2013 20,132 Month

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See Feifei in detail how to quickly get Linux command help