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Get help in Textual environment in Red Hat

man command
About man
The man command is short for manual and provides in depth information about the requested command or allows users to search for commands related to a particular keyword.
Syntax
Shows you online manuals on Unix commands.
man [-] [-k keywords] topic
-Displays the manual without stopping.
-k keywordsSearches for keywords in all of the manuals available.
topicDisplays the manual for the topic or command typed in.
Examples
man mkdir
Lists help information on the mkdir command.
man -k irc
Quickly search for manuals containing irc within them. Below is an example of what the results may look like:

circleplot (3plot) - graphics interface
dircmpdircmp (1) - directory comparison
dircolorsdircolors (1) - color setup for ls
ircIIircII (1) - interface to the Internet Relay Chat system


Navigation commands:

 1. Space: Scroll forward one screen.
2. DnArrow: Scroll forward one line.
3. UpArrow: Scroll back one line.
4. /string: Search forward for string in the man page.
5. n: Repeat previous search forward in the man page.
6. N: Repeat previous search background in the man page.
7. q: Exit man and return to the prompt.

 pinfo command
About pinfo
         pinfo is an alternative system to provide manual pages for commands, based on GNU emacs. It is provided mainly for GNU commands and utilities. It don't seem to be widely adopted from others. The pinfo command is an info reader that is relatively easy to use. The info nodes for a particular topic can be browsed with pinfo topic, and just running pinfo provides an index to all info topics. 

 Documentaion in /usr/share/doc

 By convention most other documentation is found in the /usr/share/doc directory, in sub directories named by RPM package. The /usr/share/doc directory is used to collect "everything else" if it's not  a man page, not an info page, not part of the GNOME help utitlity, it's found here.

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