These are notes collected by Joeytwiddle for various software he uses (especially on Linux).
They may offer a quick guide to getting started, and some helpful tips for initial configuration. They do not provide a complete reference.
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cht.shwhich pulls from its own DB and also fromtldrand fromcheat, and also has a powerful web service
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My allcheatsshellscript, which uses whatever you have installed
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The commandline tool tldr(Python, Node.js) which offers access to these cheatsheets
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The commandline tool cheat(Go) which allows quick access to these cheatsheets
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The commandline tool bropages(Ruby Gem) which also has a website
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LeCoupa's awesome-cheatsheets (GitHub) which covers languages and frameworks, more than commands.