Linux User Management 4

Question 1

What numeric UID range is typically reserved for system accounts on Linux?

Accepted Answer

0–499 or 0–999 depending on distro

Answer

System accounts typically use UIDs below 500 (Red Hat/CentOS) or below 1000 (Debian/Ubuntu), with regular users starting above that threshold.

Question 2

Which file must be edited to change the default shell for new users created with useradd?

Accepted Answer

/etc/default/useradd

Answer

/etc/default/useradd contains defaults like SHELL, HOME prefix, and SKEL path used by useradd.

Question 3

A user's account is locked. Which command unlocks it?

Accepted Answer

Both A and B

Answer

Both `passwd -u` and `usermod -U` unlock a locked account by removing the '!' prefix from the password hash.

Question 4

What does the `getent passwd username` command do?

Accepted Answer

Fetches user account information from all configured name service databases

Answer

getent queries the Name Service Switch (NSS) databases including /etc/passwd, LDAP, and NIS for the specified user.

Question 5

Which command renames the user 'bob' to 'robert' and also renames their home directory?

Accepted Answer

usermod -l robert -m -d /home/robert bob

Answer

usermod -l changes the login name, -d sets the new home path, and -m moves the existing home directory contents.

Linux Practice Test