To get the bios information:
In dmidecode, 0 is the type code for BIOS.# dmidecode -t 0
By using dmidecode, we can get many information about the system, for details, please refer to the man page
All the Linux systems I have been managed are Redhat running on Dell servers, so I am also using Dell OpenManage to get the system hardware information.# man dmidecode
To get the bios information
There are also many other options we can use in Dell OpenManage, for details, please refer to: http://support.dell.com/support/edocs/software/svradmin/5.1/en/omss_ug/html/cli.html#1220531$ omreport chassis bios
Please note that we can only run dmidecode as super user, whereas we can run omreport as normal user.