CLI for serial number or tag for BIOS

[Priyadarshini]

what file or command can be used to get information that can represent
unique ID for BIOS installed, it could be serial number or some tag or build
id.

I used "/usr/sbin/dmidecode | egrep -i 'BIOS Information' -A 20" command, it
shows some information about BIOS but not any information that can be used
as ID.

I tried using command "vpddecode" but it does not give required output on
linux boxes:

# vpddecode
# vpddecode 2.9
# No VPD structure found, sorry.

Please let me know hopw to get this info.

Thanks.