What commands should i type in the terminal to display my system information in Linux?

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http://i486.net – Thanks to Linux Yahoo, I took my first steps and installed Linux Mint on the computer Helinä. I play with it a bit and I like it, but I have no knowledge about how to install controladores.He tried to install pcwizard so I could see information about my system, but unfortunately the software is not compatible with Linux. Not sure what I do, its totally new environment for me. (General)