What chars can REALLY be in usernames?

[4007]

In article <1989Nov29.132320.18877 at gdt.bath.ac.uk> exspes at gdr.bath.ac.uk (P E Smee) writes:
>I posted the question in the subject field about a week ago.  Following 
>is a summary of the responses I received:
>
>		      ----------------
>
...stuff deleted
>
>At this level, then you're left with a-z, 0-9, -, and +.
>
...more stuff deleted

and it might be unwise to allow the "-" character as the
first character...

$ mail -user
mail: unknown option u
$

Recommend you stay with [a-z] for initial character of logname.
-- 
name & address       net -> dwn at swbatl.UUCP
David Neill       office -> 405-278-4007 -> swbatl!oktext!mktco
Mgr - Mktg.(SWBTCo) home -> 405-749-1141 -> swbatl!oktext!frodo!david