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In ubuntu it is possible to use the following:

sudo adduser --force-badname john.smith@example.com

This allows adding an email address as a username. The --force-badname option doesn't work in CentOS 7.

Is there a way to achieve this in CentOS 7?

  • 1
    Why the Ubuntu tag? – Jeff Schaller Jul 14 '17 at 19:16
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    Keep in mind that users on this host would not be able to receive email without significant tweaks to most out-of-the-box MTA configurations, as john.smith@example.com@example.com is not a valid email address (: – DopeGhoti Jul 14 '17 at 20:17
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This is not possible on CentOS 7 using the useradd or adduser command. This following patch prevents it and there's no --force-badname option: https://git.centos.org/blob/rpms!shadow-utils.git/c7/SOURCES!shadow-4.1.5.1-goodname.patch

You can achieve this by adding the user john.smithATSYMBOLexample.com and using vipw to do s/ATSYMBOL/@/ . It appears vipw doesn't check validity of usernames.

  • I have not used vipw before @mmckinst . Can you tell me exactly how to achieve this with vipw? Please note I am not a sysadmin – KoreMike Jul 16 '17 at 14:29
  • its just a way to edit /etc/passwd, it uses a lockfile to prevent multiple people from editing it at the same time. You could just do sed instead if you want to automate it. – Mark McKinstry Jul 18 '17 at 2:06
  • We got this working with sed: sudo adduser john.smithATexample.com sudo sed -i 's/john.smithATexample.com/john.smith@example.com/g' /etc/passwd sudo sed -i 's/john.smithATexample.com/john.smith@example.com/g' /etc/shadow – KoreMike Jul 18 '17 at 15:48

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