>From the passwd(4) manual page :
username is the user's login name.
The login (login) and role (role) fields
accept a string of no more than eight bytes
consisting of characters from the set of
alphabetic characters, numeric characters,
period (.), underscore (_), and hyphen (-).
The first character should be alphabetic and
the field should contain at least one lower
case alphabetic character. A warning message
is displayed if these restrictions are not
met.
The login and role fields must contain at
least one character and must not contain a
colon (:) or a newline (\n).
//Lars
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