Question 1

What does userdel do?

Accepted Answer

Delete a user account Deletes a user from /etc/passwd and /etc/shadow.

Question 2

Is userdel dangerous?

Accepted Answer

HIGH risk. Removes the account; with -r also its home directory and mail. Back up the home directory first: tar -czf alice-home.tgz /home/alice. Files owned by the old UID remain and could be re-assigned to a new user with the same UID. Check running processes and crontabs of the user first.

Question 3

How can I use userdel more safely?

Accepted Answer

passwd -l && chage -E0 — Lock instead of delete tar -czf -home.tgz /home/ — Back up before deleting find / -user -ls 2>/dev/null — Find files owned by the user

Flag	Meaning
`-r`	Remove home directory and mail spool⚠ Permanently deletes the user’s files.
`-f`	Force removal⚠ Even if the user is logged in.