How to get man pages in ubuntu
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Manpages are self-contained reference documents stored on the machine's hard drive. They are usually short, but can be quite long. Ubuntu's manpage system has a reference for every command-line program, and in many cases it is the only source of information.
Man displays the data using a pager , a type of program that shows files on text-based terminals one screen at a time. On Ubuntu, less is the pager that is used. The manpage system has been a part of Unix and Unix-like systems since the early s, and although it is primitive by today's standards, it is nevertheless a useful resource.
It offers a quick reference to the switches and and options available in terminal-based commands and programs such as ls , find , less , and of course, man itself. In addition, it also contains information on almost all of the GUI based programs on your system, such as gimp and firefox. This page describes how to use man at the command line, and gives an overview of the manpage system. It does not cover the tools apropos or whatis , both of which are used for searching parts of the manpage data, and both of which have equivalents in man using the -k and -f switches.
The -k and -f switches are covered here. When the manpage opens, use the up and down arrow keys and the Page Up and Page Down keys to navigate through the file. Press the Q key to quit and return to the command line. More information on using less is in the manpage for less. Manpages are grouped into nine main sections, numbered from 1 to 9.
The " 1 " part of the message in the example above indicates that the manpage being displayed is located in section 1. A brief description of the various manpage sections is at the end of this page.
It's possible for a manpage to exist in more than one section. For example, two pages exist for man itself; one is in section 1 and the other is in section 7. Finding Man Pages Use man's -k and -f switches to find manpages.
You can also use apropos and whatis , which are stand-alone equivalents of man -k and man -f. The search mechanism goes through each manpage on your system and looks at only one line in each. The line it looks at is in the NAME part of the manpage. Manpages are divided into several parts, the first of which is always the NAME part. It contains the name of the manpage and a brief one-line description of the topic it covers.
If your search term is not in the NAME part of any manpage, then your search will return zero results. Figure 1: Top portion of the man page for the ls command. The sections are described in Figure 2. Figure 2: Manpage sections. In addition to the numbered sections, three deprecated sections exist. They are the letters n , o , and l.
Manpages can also be grouped into subsections with the use of "extensions. UserDocumentation man last edited by gatoguan-os. Partners Support Community Ubuntu. Page History Login to edit. Reformatting less 1 , please wait Reformatting man 1 , please wait Reformatting man 7 , please wait Rest of page not shown.
Source: The man 1 manpage.
Master the command line: How to use man pages
Section-num : Since a manual is divided into multiple sections so this option is used to display only a specific section of a manual. So this option gives the section in which the given command is present. In this example you can move through the manual pages sections i. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks.
A very useful aspect of the Linux command line is that the documentation for almost all command line tools is easily accessible. These documents are known as man pages, and you can easily access them through the command line using the man command. In this tutorial, we will discuss the basics of man using some easy to understand examples. But before we do that, it's worth mentioning that all examples in this article have been tested on Ubuntu
man command in Linux with Examples
Is it some kind of arcane knowledge, handed down only to initiates after grueling initiations? Well, no. Actually, anyone can learn about Terminal commands, if they know where to look. The key to Terminal wisdom is the man command. In fact, man itself is a command, whose role is to format and display this documentation. Then, if you type man pwd , for example, Terminal will display the man page for the pwd command. All man pages have a common format. They begin with name the name of the command and a brief description of what it does. The pwd command I looked at above shows the following:. Next comes synopsis , which shows the command any any options, or flags, that you can use with it.
Accessing man pages on Ubuntu 16.04 LTS
I recently tutored a friend in C coding. Fortunately, there are some easy man pages that can be installed in Ubuntu that offer helpful information that I was able to use to help refresh my memory. These man pages are easily installed by installing the manpages-dev package. You can install this package via Synaptic or directly on the command line. I like the command line method personally, so I ran sudo apt-get install manpages-dev from the command line to quickly install the package.
A man page short for manual page is a form of software documentation usually found on a Unix or Unix-like operating system. Topics covered include computer programs including library and system calls , formal standards and conventions, and even abstract concepts. A user may invoke a man page by issuing the man command. By default, man typically uses a terminal pager program such as more or less to display its output.
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