In alt.os.linux.slackware, Hugh Lutley dared to utter,
> How do I sync usernames?????

The only answer you've gotten so far is "manually". There's an easier
way to take care of this using NIS, NYS, or MIS+. These are Unix
servers that send out the user information to other clients. This
allows you to log onto any NIS client using the username and password
that is running on the NIS server. Check the numerous security
vulnerabilities on any of these pieces of software before you deploy
them.

--
It is better to hear the rebuke of the wise,
Than for a man to hear the song of fools.
Ecclesiastes 7:5