get system serial number?

I want to get the system serial number from the vMA. I know it's possible with Powershell but I want it from within the vMA.

the vicfg-hostops -o info results in:

Host Name            : esx36.test.lab
Manufacturer         : HP
Model                : ProLiant BL460c G7
Processor Type       : Intel(R) Xeon(R) CPU           L5640  @ 2.27GHz
CPU Cores            : 12 CPUs x 2266 GHz
Memory Capacity      : 98293.1875 MB
VMotion Enabled      : no
In Maintenance Mode  : no
Last Boot Time       : 2010-10-02T02:13:40.499941Z

I can identify systems by mac but  it would be easier to have the serial number or service tag.