If you need more information than this book provides, there are several things you can do.
man command displays
an online manual page, or manpage, for a
given program. For example, to learn about listing files with
$ man ls
To search for manpages by keyword for a particular topic,
-k option followed by
$ man -k database
info command is an
extended, hypertext help system covering many Linux
$ info ls
info is running,
some useful keystrokes are:
To get help, type
To quit, type
To page forward and backward, use the space bar and Backspace keys
To jump between hyperlinks, press TAB
To follow a hyperlink, press Enter
info has no
documentation on a given program, it displays the program’s
manpage. For a listing of available documentation, type
info by itself. To learn how to navigate
the info system, type
--helpoption (if any)
Many Linux commands respond to the option
--help by printing a short help message.
$ ls --help
If the output is longer than the screen, pipe it into the
less program to display it in
q to quit):
$ ls --help | less
This directory contains supporting documents for many programs, usually organized by program name and version. For example, files for the text editor emacs, version 23, are likely found (depending on distro) in /usr/share/doc/emacs23.
For help with GNOME or KDE, ...