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Book: LPI Linux Certification in a Nutshell
Section: Chapter 10. Exam 101 Highlighter's Index
10.4 Documentation (Topic 1.8) 10.4.1 Objective 1: Use and Manage Local System Documentation 10.4.1.1 Text and paging -
In the context of Linux systems, plain text means files or streams of both printable characters and control characters, using a standard encoding scheme such as ASCII. -
Differentiating text from nontext isn't obvious, but the file command examines a file given as its argument and offers a response that indicates the file type. -
A pager is a program intended to offer a quick and simple interface for viewing text files, one screen at a time. -
more is a popular pager available on most Unix systems. -
less is a full-featured text pager, which emulates more and offers significant advantages. Common less commands are listed in Table 10-6. Table 10-6. Common less Commands | Space | Scroll forward one screen. | | D | Scroll forward one-half screen. | | Return | Scroll forward one line. | | B | Scroll backward one screen. | | U | Scroll backward one-half screen. | | Y | Scroll backward one line. | | g | Go to the beginning of the text (could be slow with large amounts of text). | | G | Go to the end of the text (could be slow with large amounts of text). | | /pattern | Search forward for pattern, which can be a regular expression. | | ?pattern | Search backward for pattern, which can be a regular expression. | | H | Display a help screen. | | :n | Display next file from command line (two-character command). | | :p | Display previous file from command line (two-character command). | 10.4.1.2 The man facility -
Manpages are usually found in the /usr/man directory, but they can also be found elsewhere in the filesystem. The manpage location can be found in /etc/man.config, along with the paging program to use and other information about the manpages. 10.4.1.3 /usr/doc -
Many documents for Linux systems are available in /usr/doc . Included here are package-related documents, FAQs, HOWTOs, and so on. 10.4.1.4 The info facility -
The Free Software Foundation provides the info documentation format. -
GNU software comes with info documentation. -
The documentation is viewed with the info command, which displays a full-screen editor-like paging system. Common info commands are listed in Table 10-7. Table 10-7. Common info Commands | Tab | Move among hypertext links. | | Enter | Follow hypertext links. | | d | Return to the top (directory node) of the menu. | | ? | List all info commands. | | p and n | Move to previous and next pages, respectively. | | u | Move up one level in the Texinfo hierarchy. | | q | Terminate the system. | | h | Give a primer for first-time users. | | /string | Enter a string. | | /pattern | Search forward for pattern, which can be a regular expression. | 10.4.2 Objective 2: Find Linux Documentationon the Internet 10.4.2.1 Linux Documentation Project -
A loosely knit team of writers, proofreaders, and editors who work together to create the definitive set of documentation for Linux. The Linux Documentation Project can be found online at http://www.linuxdoc.org/. -
The LDP has a wide range of documents, from complete books to personal accounts of problem-solving techniques. 10.4.2.2 Other sources -
Many Usenet newsgroups, such as comp.os.linux, comp.os.linux.advocacy, comp.os.linux.development, and others, are dedicated to Linux. -
Mailing lists offered by many Linux groups serve to keep members informed through email distribution of information. 10.4.3 Objective 3: Write System Documentation -
System manpages are an excellent place to create local documentation. -
Raw man files are usually processed using nroff for display purposes. You can use this format or simply create a text file and store it in the appropriate cat directory. -
Local manpages will probably go in /usr/local/man.  | | |
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