commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Just run this command and it will printout all the info available about your current distribution and package management system.
Many times I give the same commands in loop to find informations about a file. I use this as an alias to summarize that informations in a single command. Now with variables! :D
Very slick way to check your motherboard manufacturer, product name, version and serial number.