>Marq wrote:
>> Hi
>>
>> When i create username like this
>> "useradd user.name"
>> It shows the error message saying that the name contains invalid characters
>
>It is bad idea to create such users. For example, chown command accepts
>argument of type "user.group". You should stick with letters and numbers.
>
The chown(1) man page says that a colon ":" is the delimiting character:
NAME
chown - change file owner and group
SYNOPSIS
chown [OPTION]... [OWNER][:[GROUP]] FILE...
My advice to Marq would be to use a dummy username, and then manually edit the passwd and shadow files. We've been using usernames like first.m.last for several years to maintain compatibility with another operating system; the users don't like having to use the long usernames but it works.
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