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Distribution: At home: Arch, OpenBSD, Solaris. At work: CentOS, Debian, Ubuntu
Posts: 3,625
Rep:
Logins are handled on a per user basis, not a per group basis. If you want to prevent a user fromlogging in, you can assign them /sbin/nologin as a shell (depending on your config, they may still be able to SSH in).
I've always set my users I didn't want to log in to the shell to /bin/false. I haven't tested it thoroughly, but it seems to keep them out when SSH is used also.
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