如何在linux系统上获取命令的帮助信息,man文档的章节划分

2025-02-25 22:44:31
推荐回答(2个)
回答1:

  判断一个命令是否是Linux内置的,可以用type命令,只有Linux的内置命令才能使用 help 命令获得帮助。

type cd

输出:cd is a shell builtin

说明这个命令是系统自带的内置命令,那么就可以使用 help命令来获取帮助。

help 命令名

外部命令获取帮助文档的方式:

第一种办法是使用 --help

格式:# 命令名 --help

例如:# mkdir --help

想要获取命令的完整帮助可以使用 man 命令

格式:# man 命令名
例如:# man mkdir

man命令是调用了less工具显示文档,man的具体的操作方法和less是一样的。

man文档章节划分

描 述

NAME

程序或者命令的名称、手册节号及发布日期

SYNOPSIS

怎样调用命令,带有所有选项和参数的完整列表

DESCRIPTl0N

命令及其用法的简短小结

RETURN VALUES

程序或者库函数返回值,以及产生特定返回值的环境

EXIT STATUS

经常用来替代服TURNVALUS

OPTIONS

按字母顺序排列的选项和参数清单,如果有的话

FILES

命令使用的或者能使用的文件清单

USAGE

用程序的语言说明的简明语法,如果有的话

ENVIROMENT

命令使用的或者能使用的环境变量清单

DIAGNOSTICS

命令产生的错误信息及其解决办法的清单

NOTES

不能够归入其他任何一种类别下的所有信息

CONFORMING TO

列出程序遵循的任何标难,比如PoSIX或ISO

SEE ALSO

和命令有关的交叉索引和信息

BUGS

指出己知的bug和错误功能,以及怎样和程序的作者联系修正它们

AUTHOR

命令的作者或者维护者的名字,可能带有电子邮件地址或URL地址

回答2:

朔气概谇w

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