pure number allowed as username in the useradd command?

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Can somebody explain why pure numbers are allowed for username in the
useradd command?

sudo useradd 123456789

is not rejected!

As is known, this leads to big problems if referring to such a user and
the username differs from the userid: should such a username be
interpreted as username or userid?

Thanks for each comment.

Kind regards

--

Joachim Backes <joachim.backes@xxxxxxxxxxxxxx>

http://www.rhrk.uni-kl.de/~backes

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