![]() ![]() It's also worth noting that, as pointed out by Simon Richter, on BSDs there often exists a second uid 0 account, by convention named toor (which is "root" spelled backwards, and also lexically comes after root in a list sorted alphabetically). Calling the uid 0 account on a *nix root is a very strongly held convention, but it isn't required by the system (though it may be required by certain userland software, possibly including system administration utilities). You could just as well call the account admin, and the OS itself won't care, but some applications might not quite like it because they expect there to exist a privileged account named root. ![]() root is just a name, listed in /etc/passwd or some other authentication store. Is the name of the user account with uid 0 always root? As is pointed out by Rich Homolka in a comment, there's code in the kernel which explicitly checks for uid 0 when needing to check for the root user, which means that root always has at least uid 0. To remove a specific user from a group, you can use the gpasswd command to modify group information: $ sudo gpasswd -delete user1 demoĪlternatively, manually edit the /etc/group file and remove the user from any number of groups.There are actually two parts to your question.ĭoes the superuser account always have uid/gid 0/0 on Linux? Look in the /etc/group file or use the id command to confirm your changes: $ id user1 Use the usermod command with the -append -groups options ( -a and -G for short): $ sudo usermod -append -groups demo user1 Suppose you have existing users named user1 and user2, and you want to add them to the demo group. Verify all these changes from the /etc/group file. You can rename a group using groupmod with the -new-name or -n option: $ sudo groupmod -n test demo1 How well do you know Linux? Take a quiz and get a badge.Linux system administration skills assessment.A guide to installing applications on Linux.Download RHEL 9 at no charge through the Red Hat Developer program.You can change the group ID of any group with the groupmod command and the -gid or -g option: $ sudo groupmod -g 1011 demo1 Rerun it with a different group ID number: $ sudo groupadd -g 1010 demo1 If group ID 1009 is already allocated to another group, you're alerted that the GID is unavailable and the operation aborts. If you want to create a group with a specific group ID (GID), use the -gid or -g option: $ sudo groupadd -g 1009 demo1 You can verify that the group appears (and see its group ID) by looking in the /etc/group file. When a group is created, a unique group ID gets assigned to that group. To add a group in Linux, use the groupadd command: $ sudo groupadd demo Learning path: Deploy a cluster in Red Hat OpenShift Service on AWS (ROSA).Get a Red Hat Learning Subscription trial. ![]() Learn about Red Hat Certified System Administrator (RHCSA) certification.Explore Red Hat training and certification options.Skip to bottom of list Skip to the bottom of list ![]()
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