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I need to create users with periods in their names on CentOS7.

For example, [email protected]. It looks like this is technically supported but adduser/useradd have a regex which is preventing this. I've seen people suggest creating them without the periods and then manually adding them in /etc/passwd /etc/shadow etc. I need to create them in a script so any manual process is no bueno.

It looks like this is possible on Ubuntu as it provides /etc/adduser.conf which externally defines the regex used by adduser so that one can customize the behavior.

Any thoughts on how to do this or tools? Dr. Google has failed me :-)

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If it's for email purposes then you can create normal usernames and use email aliases for period in email address.

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I ended up recompiling the CentOS 7 shadow-utils SRPM which has these tools in to so that they would support user names with @ symbols in them.

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