References
www.gnu.org/—The website of the GNU project, it contains manuals and downloads for lots of command-line software.
http://oreilly.com/linux/command-directory/—A wide selection of Linux commands and explanations of what they do taken from O’Reilly’s excellent book Linux in a Nutshell, which is a dictionary of Linux commands.
www.tuxfiles.org/linuxhelp/cli.html—Several short command-line tutorials.
www.linuxcommand.org/—Describes itself ...
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