Bug#364909: [Pkg-shadow-devel] Bug#364909: useradd: confusion in man page; suggested fix

[Christian Perrier]

>         It is usually recommended to only use usernames that begin with
>         a lower case letter or an underscore, and are only followed by
>         lower case letters, underscores, dashes, and dollar signs. In
>         regular expression terms: '[a-z_][a-z0-9_-]*[$]'.
>         On Debian, the constraints on the username are loosened: Usernames
>         must neither start by a dash ('-') nor contain a colon (':') or an
>         end of line ('\n').


Maybe also mention that the dollar sign is only tolerate as the last
character of the username (motivated by Samba, actually).

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