BIOS

dmidecode

sudo apt install dmidecode
sudo dmidecode -t bios

inxi

inxi can get a TON of information about many aspects such as CPU, RAM, and BIOS:

sudo apt install inxi
inxi -Fxxxz

hwinfo

sudo hwinfo --bios

WMIC

WMIC is windows only, but still very useful

wmic bios get /format:list
wmic bios get name,serialnumber,version

Powershell

Though powershell is on windows and linux, this particular command only works on windows.

Get-WmiObject Win32_BIOS
Get-CimInstance -ClassName Win32_BIOS