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Date: Sun, 29 Dec 1996 20:26:16 +0100
From: Wolfram Schneider <wosch@cs.tu-berlin.de>
Message-Id: <199612291926.UAA03797@campa.panke.de>
To: Masafumi NAKANE/=?ISO-2022-JP?B?GyRCQ2Y6LDJtSjgbKEI=?= <max@wide.ad.jp>
Cc: current@freebsd.org
Subject: usable characters for login names
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Masafumi NAKANE writes:
>Now, adduser rejects underscore and hyphen.  Pw useradd accepts `_'
>but rejects `-'.  Is there any explicit source code or documentation
>stating about legal characters for logins?

Illegal characters are characters which break password database
(':', '\0', '\n'), group database (comma, spaces), mail
addresses (many characters), or any other important program. 

Only characters which are on any keyboard in the world should be used.

Wolfram