I keep a commands.org file for exactly this purpose. Whenever a command is useful to maintain outside of my shell history, it gets documented and placed there,

I keep a commands.org file for exactly this purpose. Whenever a command is useful to maintain outside of my shell history, it gets documented and placed there, along with variations, things to look out for, etc. Eventually I'd like to publish it as a microblog for such snippets ala commandlinefu.com, but priorities and laziness get in the way. :/