In Linux, groups are used to organize and administer user accounts. The primary purpose of groups is to define a set of privileges such as reading, writing, or executing permission for a given resource that can be shared among the users within the group.
In this article, we will talk about how to create new groups in Linux, using the
groupadd Command Syntax
The general syntax for the
groupadd command is as follows:
groupadd [OPTIONS] GROUPNAME
Only the root or a user with sudo privileges can create new groups.
groupadd creates a new group using the options specified on the command line plus the default values specified in the
Creating a Group in Linux
To create a new group type
groupadd followed by the new group name.
For example, to create a new group named
mygroup you would run:
The command adds an entry for the new group to the
Once the group is created, you can start adding users to the group.
If the group with the same name already exist, the system will print an error message like the following:
groupadd: group 'mygroup' already exists
To suppress the error message if the group exist and to make the command exit successfully, use the
groupadd -f mygroup
Creating a Group with Specific GID
In Linux and Unix-like operating systems, groups are identified by its name and a unique GID (a positive integer).
By default, when a new group is created, the system assigns the next available GID from the range of group IDs specified in the
--gid) option to create a group with a specific GID.
For example to create a group named
mygroup with GID of
1010 you would type:
groupadd -g 1010 mygroup
getent group | grep mygroup
If a group with the given GID already exist, you will get the following error:
groupadd: GID '1010' already exists
When used with the
--non-unique) option the
groupadd command allows you to create a group with non-unique GID:
groupadd -o -g 1010 mygroup
Creating a System Group
There is no real technical difference between the system and regular (normal) groups. Usually, system groups are used for some special system operation purposes, like creating backups or doing system maintenance.
System groups GIDs are chosen from the range of system group UDs specified in the
login.defs file, which is different than the range used for regular groups.
--system) option to create a system group. For example, to create a new system group named
mysystemgroup you would run:
groupadd -r mysystemgroup
Overriding the Default
--key) option followed by
KEY=VAL allows you to override the default values specified in the
Basically, all you can override are the maximum and minimum values of the normal and system group IDs for automatic GID selection when creating a new group.
Let’s say you want to create a new group with GID in the range between 1200 and 1500. To do that, specify the min/max values as shown below:
groupadd -K GID_MIN=1200 -K GID_MAX=1500 mygroup
Creating a System Group with Password
Adding a password to a group has no practical use and may cause a security problem since more than one user will need to know the password.
--password) option followed by password allows you to set a password for the new group:
groupadd -p grouppassword mygroup
In Linux, you can create new groups using the
The same instructions apply for any Linux distribution, including Ubuntu, CentOS, RHEL, Debian, Fedora, and Arch Linux.
Feel free to leave a comment if you have any questions.