要想熟悉 Liunx 的命令，需要求助于神一样的男人，那就是 man page，它可以帮助你更好的了解各个命令的用法，其实 man 是 manual 的简写。
本篇文章你会学习到：
- man page 的主要部分
- man page 的操作
- man page 命令
- info page
我们输入命令 man date 屏幕中会出现：
DATE(1) User Commands DATE(1)
NAME
date - print or set the system date and time
SYNOPSIS
date [OPTION]... [+FORMAT]
date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
DESCRIPTION
Display the current time in the given FORMAT, or set the system date.
Mandatory arguments to long options are mandatory for short options too.
-d, --date=STRING
display time described by STRING, not 'now'
--debug
annotate the parsed date, and warn about questionable usage to stderr
-f, --file=DATEFILE
like --date; once for each line of DATEFILE
-I[FMT], --iso-8601[=FMT]
output date/time in ISO 8601 format. FMT='date' for date only (the default),
'hours', 'minutes', 'seconds', or 'ns' for date and time to the indicated pre‐
cision. Example: 2006-08-14T02:34:56-06:00
// ...
FORMAT controls the output. Interpreted sequences are:
%% a literal %
%a locale's abbreviated weekday name (e.g., Sun)
// ...
By default, date pads numeric fields with zeroes. The following optional flags may
follow '%':
- (hyphen) do not pad the field
_ (underscore) pad with spaces
0 (zero) pad with zeros
// ...
EXAMPLES
Convert seconds since the epoch (1970-01-01 UTC) to a date
$ date --date='@2147483647'
Show the time on the west coast of the US (use tzselect(1) to find TZ)
$ TZ='America/Los_Angeles' date
Show the local time for 9AM next Friday on the west coast of the US
$ date --date='TZ="America/Los_Angeles" 09:00 next Fri'
DATE STRING
The --date=STRING is a mostly free format human readable date string such as "Sun, 29
Feb 2004 16:21:42 -0800" or "2004-02-29 16:21:42" or even "next Thursday". A date
string may contain items indicating calendar date, time of day, time zone, day of
week, relative time, relative date, and numbers. An empty string indicates the begin‐
ning of the day. The date string format is more complex than is easily documented
here but is fully described in the info documentation.
AUTHOR
Written by David MacKenzie.
REPORTING BUGS
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>
COPYRIGHT
Copyright © 2019 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or
later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WAR‐
RANTY, to the extent permitted by law.
SEE ALSO
Full documentation <https://www.gnu.org/software/coreutils/date>
or available locally via: info '(coreutils) date invocation'
GNU coreutils 8.31 March 2019 DATE(1)
man page 的主要部分：
- NAME：指令说明
- SYNOPSIS：指令愈发
- DESCRIPTION：指令描述
- OPTIONS：语法中的可选项
- COMMANDS：
- FILES：
- SEE ALSO：其它参考
- EXAMPLE：指令示例
man page 的操作：
- [Space]：下一页
- [Page Down]：下一页
- [Page Up]：上一页
- [Home]：到第一页
- [End]：到最后页
- /string：向下搜索
- ?string：向上搜索
- n,N：查找下一个
- q：结束
man page 命令：
man (选项) (参数) 指令或数据
- man -f ：查询更多该命令相关的信息，等价于 whatis
- man -k ：查询所有该关键字相关信息，等价于 apropos
- man 1 ：查询某一个版本的文档
info page
基本上，info 与 man 的用途其实差不多，都是用来查询指令的用法或者是文件的格式。但是与 man page 一口气输出一堆信息不同的是，info page 则是将文件数据拆成一个一个的段落，每个段落用自己的页面来撰写，并且在各个页面中还有类似网页的“超链接”来跳到各不同的页面中，每个独立的页面也被称为一个节点。
- 内容
- File Node Next Up Prev
- Info
- Menu
- 操作
- [Space]：下一页
- [Page Down]：下一页
- [Page Up]：上一页
- [Tab]：在 node 之间移动
- [Enter]：进入该 node
其它
- man page 存储在：
/usr/share/man/ - info page 存储在：
/usr/share/info/ - 其它文档存储在：
/usr/share/doc/
〖坚持的一俢〗
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