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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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I put that line in my .bash_profile (OS X) and .bashrc (Linux).
Here is a summary of what the \char means: n=new line, u=user name, h=host, !=history number, w=current work directory
The \[\e[32m\] sequence set the text to bright green and \[\e[0m\] returns to normal color.
For more information on what you can set in your bash prompt, google 'bash prompt'
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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