查看“手册页”的源代码

== 用法 ==
为查阅某个Unix命令的手册页，用户可以在[[Shell|命令行界面]]执行如下命令：<ref>{{cite web |title=命令列基本操作 |url=https://dywang.csie.cyut.edu.tw/dywang/linuxSystem/node18.html |website=dywang.csie.cyut.edu.tw |accessdate=2023-11-03 |archive-date=2023-03-29 |archive-url=https://web.archive.org/web/20230329155221/https://dywang.csie.cyut.edu.tw/dywang/linuxSystem/node18.html |dead-url=no }}</ref>

<syntaxhighlight lang="bash">
man <command_name>
</syntaxhighlight>

<syntaxhighlight lang="bash">
#範例：查詢 cal(calendar) 指令用法。
[user101@twfo-mdc ~]$ man cal
CAL(1)                    BSD General Commands Manual                   CAL(1)

NAME
     cal - displays a calendar

SYNOPSIS
     cal [-smjy13] [[month] year]

DESCRIPTION
     Cal displays a simple calendar.  If arguments are not specified, the cur-
     rent month is displayed.  The options are as follows:

     -1      Display single month output.  (This is the default.)

     -3      Display prev/current/next month output.

     -s      Display Sunday as the first day of the week.  (This is the
             default.)

     -m      Display Monday as the first day of the week.

     -j      Display Julian dates (days one-based, numbered from January 1).

q     -y      Display a calendar for the current year.

     A single parameter specifies the year (1 - 9999) to be displayed; note
     the year must be fully specified: “cal 89” will not display a calendar
     for 1989.  Two parameters denote the month (1 - 12) and year.  If no
     parameters are specified, the current month's calendar is displayed.

     A year starts on Jan 1.

     The Gregorian Reformation is assumed to have occurred in 1752 on the 3rd
     of September.  By this time, most countries had recognized the reforma-
     tion (although a few did not recognize it until the early 1900's.)  Ten
     days following that date were eliminated by the reformation, so the cal-
     endar for that month is a bit unusual.

HISTORY
     A cal command appeared in Version 6 AT&T UNIX.

OTHER VERSIONS
     Several much more elaborate versions of this program exist, with support
     for colors, holidays, birthdays, reminders and appointments, etc. For
     example, try the cal from http://home.sprynet.com/~cbagwell/projects.html
     or GNU gcal.

BSD                              June 6, 1993                              BSD
</syntaxhighlight>


例如，“<tt>man ftp</tt>”。为了方便用户查阅输出的信息，man命令一般会提供一个[[Less (Unix)|Less]]{{tsl|en|Terminal pager|終端機分頁檢視程式}}。

按惯例，man页面可以按照“程序名(区段)”的标记来查阅：例如{{man|1|ftp|||inline}}。相同的手册页标记可能出现在多个不同的区段（section）中，例如相同的名字在[[系统调用]]、用户[[命令 (计算机)|命令]]或[[Troff]]{{noteTag|原編輯譯名用『宏软件包』,因為「巨集」（英語：Macro）的中國大陸常用別名是「宏」}}中重复出现的时候。比如{{man|1|man|||inline}}与 {{man|7|man|||inline}}，以及{{man|2|exit|||inline}}与{{man|3|exit|||inline}}。

访问非默认手册页区段的语法在不同的软件实现中是不一样的。例如，在[[Solaris]]中，阅读{{man|3|printf|||inline}}的语法为：
<syntaxhighlight lang="bash">
man -s 3c printf
</syntaxhighlight>
在[[Linux]]和类BSD系统中，相同的命令语法为：
<syntaxhighlight lang="bash">
man 3 printf
</syntaxhighlight>

此命令在手册页的第3区段中搜寻“[[printf]]”的信息。