Command Line Cheat Sheet for Mac and Linux. I know these, but always good to have on hand!
#MySQL Cheat Sheet by Example
IT Cheat Sheet. Information Technology Shortcuts and Helpful Codes
60 Linux System Administration Commands from beginner to advanced. #linux #opensource
This cheat contains nearly complete list of command prompt commands available on Windows 7 and Vista.
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Invent with Python Bookshelf - Free Python Programming Books ~~~~~~~~~~~~~~~~~~~~~~~ see also: http://automatetheboringstuff.com/
Stuff to Try
Linux admin quick reference.
Love this infographic on the myths of open source software. At CX, we love open source software and use it ourselves. Read our blog about it here: http://blog.cx.com/cloud-storage-news/open-source-software/
Keep This Python Cheat Sheet on Hand When Learning to Code http://lifehacker.com/keep-this-python-cheat-sheet-on-hand-when-learning-to-c-1655521825