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In systems such as Debian, there is a file /etc/adduser.conf which includes directive NAME_REGEX that can be used to define which characters are allowed in a username.

Is there a way to do this in CentOS 6.9? I can see that there is a file /etc/default/useradd but there is no indication anywhere in the documentation that it could support a similar directive.

I would like to be able to create a username with the @ sign in it, such as user@domain.com.

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    what are your trying to achieve here ? – Kiwy Jun 14 '18 at 12:00
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    I would like to be able to create a username with the '@' sign in it, such as user@domain.com – Petr Břeň Jun 14 '18 at 12:09
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    dont do that. it will break so many thing for example you won't be able to connect via ssh on the machine because ssh user@domain@hostname will never work. – Kiwy Jun 14 '18 at 12:11
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    I've edited your question to make it clearer. Relevant details should really be added to the question so that it can be answered without having to read the comments. – Anthony Geoghegan Jun 14 '18 at 13:17
  • serverfault.com/q/879393/131555 interesting question with some background ;-) – Kiwy Jun 14 '18 at 13:30

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