$ sudo usermod -aG sudo, office, remote_users samreenaĪdding a New User and Add to Multiple Groups in Ubuntu In the following example, we add an existing user “samreena” to the multiple groups such as sudo, office, and remote_users. $ sudo usermod -a -G first_group, second_group username To add an existing user to the multiple groups, you can use the “usermod” command along with “-aG” option and then enter the group names separated by commas. Adding an Existing User to the Multiple Ubuntu Groups The “-a” option adds an existing user to the group without removing the current group. In the previous command, we added an existing user “samreena” to the sudo group. You can use the following command to add an existing user to a sudoer group: You can either create a new user in your Ubuntu system or you can add an existing user to the sudoers group. In the following example, we add a new group “mytest_group” in our system:Īdding an Existing User to the Sudoer Group You can create or add a new group to your Ubuntu 22.04 system using the “addgroup” command. We will also go into further detail on how to add a user to the group in Ubuntu 22.04 LTS Jammy Jellyfish Linux distribution. We’ll talk about in this guide how many types of groups are available in the Linux distribution. Only the root or users with the sudo privilege can add the users as group members. On a Linux system, each user is a part of one primary group and may also be a part of one or more secondary groups. The members of a group inherit the group’s write, read, and execute rights. They are intended to handle both the individual files and software applications. The secondary groups are important for allowing the group members’ access to specific files. The user’s primary group information is stored in a file located at “/etc/passwd” in your Ubuntu system. Two types of groups exist in Ubuntu and other Linux distributions: primary and secondary groups. The key element of groups is the identification of a set of rights that can be shared by all group members, such as the access to a resource for writing, reading, or executing. Many distinct tasks and functions are assigned to various Linux users. The user account administration is simple and quick with groups. Use them wisely.In Linux, groups are the objects or entities that are used to manage and organize a large number of user accounts at once. These commands work well in most main stream *nix and BSD distributions. I suggest bouncing your system prior to logging on with the newly created root-level user account. You should now see something similar to: uid=0(root) gid=0(root) groups=0(root). The characters following the -u and -g switches are each "zero") id (in the usermod command string, the first switch is the letter "O". You should see something similar to: uid=1001(newusername) gid=1001(newusername groups=0(root). ** You agree by using the information contained herein that any negative impact or results to any system, data or network are entirely your responsibility.Ĭreate additional root-level accounts by running these commands from a terminal session: sudo su Use may result in a security compromised system or you may render your system COMPLETELY UNUSABLE. **Before using the following commands, it is your responsibility to understand the ramifications of creating and using a root-level account. Such behavior creates MORE security issues than sharing the information to allow a user to create alternate root accounts. However, the self-proclaimed experts who repeatedly belch forth the tired "I-know-how-but-I'm-not-going-to-tell-you-so-go-learn-SUDO-&-sudoers" mantra are the same individuals who post explicit command-line configurations for complex OS & service installations or modifications INCLUDING THE SUDO command, without considering that newbies are simply copying & pasting these commands into their installations without understanding ANY of the risks or the increased attack surface the changes may be creating. First, as an infosec professional I completely agree with the additional security benefits and best practices SUDO provides.
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