Heh, a comment in Jawn's debdiff:
* User/group names must match [a-z_][a-z0-9_-]*[$]
I found period also worked fine:
root@u20:~# useradd 0.0
root@u20:~# getent passwd 0.0
0.0:x:1001:1001::/home/0.0:/bin/sh
root@u20:~# userdel 0.0
root@u20:~# getent passwd 0.0
root@u20:~# exit
I know comments are almost always out of date by the time I read them,
but this one seems wronger than usual. :)
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https://bugs.launchpad.net/bugs/1927078
Title:
Don't allow useradd to use fully numeric names
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