Create Delete And Modify Local Groups And Group Memberships

General Information

Local group management.

Groups config file

• /etc/group

See what groups a user is a part of (two methods)

id student
groups student

See what members are apart of the group “class1”

getent group class1
OR
groupmems -l -g class1

Create new group

groupadd class1

• Other options
  • -g ⇒ specify a group id
  • -r ⇒ create a system group

Set primary group (-g) for the user “student” to “class1”

usermod -g class1 student

Append (-a) supplementary group(-G) for the user “student”

usermod -aG class2 student

Change group name to “class5” from “class1”

groupmod -n class5 class1

Delete group

groupdel class5

• Note: Cannot delete a user's primary group