Exercise
- Use groupadd command to create 3 groups
- dev
- test
- admin
groupadd dev
groupadd test
groupadd admin
- Create 3 users
- usr1 in Group dev with password and home directory
useradd -g dev -d /home/usr1 -p password usr1- usr2 in Group test with password and home directory
useradd -g test -d /home/usr2 -p password usr2- usr3 in Group admin with password and home directory
useradd -g admin -d /home/usr3 -p password usr3- usr4 in Groups dev and test with password and home directory
useradd -G dev,test -d /home/usr4 -p password usr4 - To check the user groups
su <username>
groups
- To add user to existing groups
man usermod
usermod -aG <group-name> <user-name>
- Try deleting the users using userdel and groups using groupdel
ROOT User and sudo
- Root user is super user and has access to every thing on a linux machine.
- For the non root users to perform administrative actions on linux machines, there is a file in /etc/sudoers
- On Ubuntu Machine to give existing user permissions to sudo, add user to sudo group
- On Redhat family (Centos, RHEL, Fedora, Amazon Linux) Machine to give existing user permissions to sudo, add user to wheel group
