Windows

Open a command prompt (by choosing the Command Prompt item from the Start menu, or typing cmd in the Startmenu's "Run" box), and type the following:



wmic bios get serialnumber




Note: Windows 8 and 8.1 users may get to the Command Prompt by right clicking on Start button, or by typing "cmd" on Start screen to search it.

Mac OS X

Go to Utilities. Open the Terminal application and type:



ioreg -l | grep IOPlatformSerialNumber




Linux

Open a shell and type:



sudo dmidecode -t system | grep Serial




Note: The user will need to have root access to the system.

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