commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Very slick way to check your motherboard manufacturer, product name, version and serial number.
Advanced information about RAM.
Command used to know if we are working on a virtual or physical machine. This command will use the dmidecode utility to retrieve hardware information of your computer via the BIOS. Run this command as root or with sudo.
This returns the hardware serial number. Dell calls this the "Service Tag" and it can be used to retrieve warranty information or used for RMA / repairs.