linuxexpert-practice-labs/labs/linux-terminal/3-5-users-and-groups

Using Linux Terminal 3.5: Users and groups

Creating a user with useradd, adding groups, locking an account, and removing one and finding what it left behind.

Before you start

Work as root (sudo -i), and write answers to the files in /root/lab-answers/. The lab checks that user hana, UID 1500 and group qa don't exist yet. It creates user lou, who has files outside his home directory. Task 4 removes lou rather than hana, so that hana stays for grading. le-lab reset removes hana, qa and lou's files.

Tasks

1. With useradd, create hana with a home directory, bash, the comment "Hana Ito" and UID 1500, in a new group qa as well as her own. Set her a password.
2. Add hana to adm without removing her from qa.
3. Stop hana logging in by any means, without deleting anything: passwd -S hana shows L, chage -l hana shows an account expiry date in the past, and su - hana fails.
4. Remove lou's account and home directory, then find anything he left on the root filesystem, and write the paths to /root/lab-answers/4.

Hints

• groupadd; useradd -m -s -c -u -G; passwd; check with getent passwd hana, id hana, passwd -S hana.
• usermod -aG: without -a, -G replaces the list.
• usermod -L (or passwd -l) locks the password only; usermod -e 1 or chage -E 0 expires the account, which also stops SSH keys.
• userdel -r, then find / -xdev -nouser.