Ok, having my home connectivity restored at least temporarily I've now signed all the user keys that /home/*/pubkey.asc found.
That was a few!
I'm rather flabbergasted how can gpg not have an option "list all keys that match criteria X". Maybe I'm just blind.
It seems to me that the easiest way to sign a ton of keys is to:
1) gpg --import /home/*/pubkey.asc 2) in other window gpg --list-sigs | grep -v "User id not found" | less and look for keys we haven't signed 3) gpg --sign <paste-from-other-window>, repeat until 4) gpg --send-keys 4) gpg --armor --export > ...
Not all that automatable.
Cheers,
-- Nikodemus Siivola