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四种方法：man、info、help和–help

man

用于查看命令使用帮助、软件服务配置文件、系统调用和函数帮助。

使用方法

> man [参数选项] [命令/文件][参数选项]：1、2、3、4、5、6、7、81：用户命令相关2：系统调用相关3：C库函数相关4：设备和特殊文件相关5：文件格式和规则6：游戏及其他7：宏、包等8：系统管理员命令和进程> man 1 cpCP(1)                                                                                                       User Commands                                                                                                      CP(1)NAME       cp - copy files and directoriesSYNOPSIS       cp [OPTION]... [-T] SOURCE DEST       cp [OPTION]... SOURCE... DIRECTORY       cp [OPTION]... -t DIRECTORY SOURCE...

info

用于查看程序对应的文档信息

使用方法

> info [命令]> info cpFile: coreutils.info,  Node: cp invocation,  Next: dd invocation,  Up: Basic operations11.1 'cp': Copy files and directories====================================='cp' copies files (or, optionally, directories).  The copy is completelyindependent of the original.  You can either copy one file to another,or copy arbitrarily many files to a destination directory.  Synopses:

help

用于获取bash内置命令帮助

使用方法

> help [命令]> help cdcd: cd [-L|[-P [-e]]] [dir]    Change the shell working directory.        Change the current directory to DIR.  The default DIR is the value of the    HOME shell variable.

–help

同man命令，但只获取基础的帮助

使用方法

> [命令] --help> cp --helpUsage: cp [OPTION]... [-T] SOURCE DEST  or:  cp [OPTION]... SOURCE... DIRECTORY  or:  cp [OPTION]... -t DIRECTORY SOURCE...Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.Mandatory arguments to long options are mandatory for short options too.  -a, --archive                same as -dR --preserve=all      --attributes-only        don't copy the file data, just the attributes      --backup[=CONTROL]       make a backup of each existing destination file  -b                           like --backup but does not accept an argument      --copy-contents          copy contents of special files when recursive  -d                           same as --no-dereference --preserve=links  -f, --force                  if an existing destination file cannot be                                 opened, remove it and try again (this option                                 is ignored when the -n option is also used)

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