Ask a dead kernel its version

[Seeker]

That is ...
I would like to query /boot/kernel.old/kernel, for its revision. (i.e; 8.1)

I.e. this gave me its ident:

config -x /boot/kernel.old/kernel | grep ident | grep -Eo '[A-Z]+$'

 

[Beastie]

% strings kernel | tail
Refine it as you wish.