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groupmod

`groupmod` command is a Linux command-line tool used to modify properties of user groups, such as user group name and GID.

User group

Add a user to the user group (-a)

Set the GID of the user group (-g)

Set the name of the user group (-n)

Allow non-unique GID (-o)

Set the password of the user group (-p)

Set the GID range of the user group (-R)

Examples

Rename the user group developers to devs:
```
groupmod -n devs developers
```
Change the GID of the user group testers to 1001:
```
groupmod -g 1001 testers
```
Add the user alice to the user group developers:
```
groupmod -a -G developers alice
```
Set the password of the user group staff to password:
```
groupmod -p password staff
```
Allow non-unique GID:
```
groupmod -o developers
```
Set the GID range of the user group users to 1000-2000:
```
groupmod -R 1000-2000 users
```