I know it's silly and meaningless but…

[NOYB]

…this bugs me.

**** WARNING ****
Reboot will be required!!
Proceed with upgrade? (y/N)

Is the mixed case "y/N" intentional?

[csutcliff]

I believe it's there to indicate that the default action (with no user input except enter) is "N"

[cmb]

@csutcliff:

I believe it's there to indicate that the default action (with no user input except enter) is "N"

Correct. That's the standard use of capitalization for many *nix CLI apps, the capital letter is the default.

[JasonJoel]

Agreed. It is correct as-is. Capital=default action.