wmic bios get serialnumber
Reference: http://support.microsoft.com/kb/558124
New formats:
Get-WmiObject -Class "Win32_SystemEnclosure" | Select-Object SerialNumber # OR Get-CimInstance -Class "Win32_SystemEnclosure" | Select-Object SerialNumber
Another type of Query:
Get-WmiObject -Query "SELECT * FROM Win32_ComputerSystem" -ComputerName . # OR Get-CimInstance -Query "SELECT * FROM Win32_ComputerSystem" -ComputerName .