The correct command is `usermod -s /bin/bash alice`, which directly changes the login shell from `/sbin/nologin` to `/bin/bash` in the `/etc/passwd` file. The `/sbin/nologin` shell is a restricted shell that immediately exits, preventing any interactive login—including SSH—so changing it to `/bin/bash` restores normal shell access for the user. On the LFCS exam, this scenario tests your understanding of user account management and the role of the login shell field in `/etc/passwd`. A common trap is confusing `usermod` with `chsh`; while `chsh` can also change a shell, it requires the user to be logged in, which is impossible here, making `usermod` the correct administrative tool. Remember the mnemonic: "No login? No problem—usermod -s solves the shell."
LFCS User and Group Management Practice Question
This LFCS practice question tests your understanding of user and group management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A user 'alice' cannot log in via SSH. The administrator checks /etc/passwd and sees: alice:x:1002:1002::/home/alice:/sbin/nologin. Which command should be used to allow alice to log in with a bash shell?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
usermod -s /bin/bash alice
Option C is correct because the /sbin/nologin shell in the /etc/passwd entry prevents alice from logging in via SSH. The usermod -s /bin/bash alice command changes alice's login shell to /bin/bash, allowing interactive SSH sessions. This directly addresses the shell restriction without altering other account properties.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
usermod -d /home/alice alice
Why it's wrong here
-d changes the home directory, not the shell. The shell is still /sbin/nologin.
✗
usermod -u 1002 alice
Why it's wrong here
-u changes the UID, which is already 1002. Does not affect shell.
✓
usermod -s /bin/bash alice
Why this is correct
usermod -s changes the login shell to /bin/bash, allowing interactive login.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
useradd -m -s /bin/bash alice
Why it's wrong here
useradd creates a new user; alice already exists. This would fail or create a duplicate.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the shell field with other fields like home directory or UID, or attempt to recreate the user with useradd instead of modifying the existing account with usermod.
Detailed technical explanation
How to think about this question
The /sbin/nologin shell is a program that prints a message and exits, effectively denying login. The /etc/passwd file's seventh field defines the login shell; SSH uses this to determine the shell to spawn after authentication. Changing the shell with usermod -s updates this field directly, and the change takes effect immediately without requiring a service restart.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the LFCS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
User and Group Management — This question tests User and Group Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: usermod -s /bin/bash alice — Option C is correct because the /sbin/nologin shell in the /etc/passwd entry prevents alice from logging in via SSH. The usermod -s /bin/bash alice command changes alice's login shell to /bin/bash, allowing interactive SSH sessions. This directly addresses the shell restriction without altering other account properties.
What should I do if I get this LFCS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. You are the Linux administrator for a medium-sized company that uses a centralized authentication system (LDAP) for user accounts, but local files (/etc/passwd, /etc/shadow, /etc/group) are also used for a few service accounts. The server is running RHEL 8. A new employee, 'jane', needs to be added to the local system for a temporary project. You create the user with 'useradd jane' and set a password with 'passwd jane'. However, when jane tries to log in via SSH using her password, she receives 'Permission denied, please try again.' The SSH server is configured to allow password authentication. Other users (both LDAP and local) can log in successfully. You verify that the password was set correctly and that the account is not locked. What is the most likely cause and solution?
hard
A.Configure the SSH daemon to allow password authentication for local users
✓ B.Change jane's login shell to /bin/bash using usermod -s /bin/bash jane
C.Unlock the account using passwd -u jane
D.Remove the password expiry for jane using chage -E -1 jane
Why B: Option B is correct because the default shell for a new user created with 'useradd' on RHEL 8 is often /sbin/nologin, which prevents login. SSH authentication succeeds at the password level, but the session is immediately rejected because the shell is not a valid interactive shell. Changing the shell to /bin/bash with 'usermod -s /bin/bash jane' resolves this.
Last reviewed: Jun 11, 2026
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This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.
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