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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
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» http://twitter.com/commandlinefu3
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Quietly get a webpage from wikipedia: curl -s
By default, don't output anything: sed -n
Search for interesting lines: /<tr valign="top">/
With the matching lines: {}
Search and replace any html tags: s/<[^>]*>//g
Finally print the result: p
Oneliner to get domain names list of all existing domain names (from wikipedia)
The command line can be accessed by using the cmd command which will open a command window with a DOS interface. The command line is a throw back to the early days of computing before there was a Windows interface.
You would need pwgen installed first, on ubuntu you can get it by apt-get
sudo apt-get install pwgen