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I just had a look at my system's dmesg and I don't see that. Possible to show up but it depends on driver in-use as well. I mean if driver is written or specifically instructed to disclose then it will show up else it will not.
The link that you shared is about performing network installation and they have explained various options available with grub. So, I have no idea on why you are looking for mac address or hdd serial number as it can be done without those as well.
You said you want to know hdd serial number and mac address during boot up. Still am not sure why it is required.
If you want to know the serial number of your hdd you can run:
hdparm -I /dev/sdX
where X is the alphabet assigned on the basis of the slot you attached your hdd to.
For getting the MAC address you can simply use:
where X is number assigned to your network card.
You said you want to see it during bootup. Not sure if it will be possible, what I can think of is putting these commands in /etc/rc.d/rc.sysinit which is a script that runs by init during boot process. Make sure that you do not mess up with this script. Edit carefully and make sure you back it up before editing.
okay i got it..
checked those commands in terminal and it gives the result what i want.
Now i have to put commands in rc.sysinit file.
where should i add these commands in the file, is it ok if i add them at the start??
I have already taken backup of the file , so that if something goes wrong with the original file then i will replace with the backup.