The following online guides are available:
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AptGetHowto - using apt-get to install packages from the command line.
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Commandline Repository Editing - adding the Universe/Multiverse repositories through the command line.
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grep Howto - grep is a powerful command line search tool.
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find - locate files on the command line.
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CommandlineHowto - longer and more complete than this basic guide, but still unfinished.
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HowToReadline - information on some more advanced customization for the command line.
For more detailed tutorials on the Linux command line, please see:
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http://linuxcommand.org/- basic BASH tutorials, including BASH scripting
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http://linuxsurvival.com/index.php- Java-based tutorials
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http://rute.2038bug.com/index.html.gz- a massive online book about system administration, almost all from the command line.