Sign key and export for each UID

[Tobias Mueller]

Hi.

I'm digging up this thread because it asked the same question I have,
but it hasn't really been answered:

On Tue, Sep 17, 2013 at 06:23:35AM +0000, atair wrote:
> Is there a way to achieve the same signatures from gpg command line?
> For example
> $ gpg -a --export <uid>
> exports the complete key and not just the signature. However, I
> understand the gpg-man pages in a way that it's possible to do a
> $ gpg -u <my_keyid> --edit-key <other's_keyid>
> > sign <other's_first_uid>
> > sign <other's_second_uid>
> > ...
> > q

What are the best practises for signing another person's key (i.e. all the UIDs 
on a key)?

And how do you follow those using gnupg?  And is there a batch mode to automate that process?

Cheers,
  Tobi