Free LFCS: Linux Foundation Certified System Administrator Exam Questions and Answers

Last updated: September 19, 2026

Exam code

LFCS

Provider

Linux Foundation

Questions in our bank

1000+

Free to read

First 10, with answers

Official page

Official Exam website

Our test mode duration & pass mark

130 mins · 70%

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1. Question #1

   Which of the following sequences in the vi editor saves the opened document and exits the editor?(Choose TWO correct answers.)

   Select 2 answers.

   • A. esc ZZ
   • B. ctrl :w!
   • C. esc zz
   • D. esc :wq!
   • E. ctrl XX
   Reveal Answer

2. Question #2

   Which command chain will count the number of regular files with the name of foo.txt within /home?

   • A. ls -lR /home | grep foo.txt | wc -l
   • B. find /home -type f -name foo.txt | wc -l
   • C. find /home -name foo.txt -count
   • D. find /home -name foo.txt | wc -l
   • E. grep -R foo.txt /home | wc -l
   Reveal Answer

3. Question #3

   Which of the following may occur as a consequence of using the command ifconfig? (Choose THREE correct answers.)

   Select 3 answers.

   • A. New name servers may be added to the resolver configuration.
   • B. Network interfaces may become active or inactive.
   • C. The routing table may change.
   • D. IP addresses may change.
   • E. The system's host name may change.
   Reveal Answer

4. Question #4

   Which of the following file permissions belong to a symbolic link?

   • A. -rwxrwxrwx
   • B. +rwxrwxrwx
   • C. lrwxrwxrwx
   • D. srwxrwxrwx
   Reveal Answer

5. Question #5

   When running the command sed -e "s/a/b/" /tmp/file >/tmp/file While /tmp/file contains data, why is /tmp/file empty afterwards?

   • A. The file order is incorrect. The destination file must be mentioned before the command to ensure redirection.
   • B. The command sed did not match anything in that file therefore the output is empty.
   • C. When the shell establishes the redirection it overwrites the target file before the redirected command starts and opens it for reading.
   • D. Redirection for shell commands do not work using the > character. It only works using the | character instead.
   Reveal Answer

6. Question #6

   What is the output of the following command? echo "Hello World" | tr -d aieou

   • A. Hello World
   • B. eoo
   • C. Hll Wrld
   • D. eoo Hll Wrld
   Reveal Answer

7. Question #7

   Which of the following tasks can be accomplished using the command date? (Choose TWO correct answers.)

   Select 2 answers.

   • A. Synchronize the hardware and system clocks.
   • B. Output date and time in different formats.
   • C. Set the system clock.
   • D. Set the hardware clock.
   • E. Update the time via NTP.
   Reveal Answer

8. Question #8

   What is true regarding the command userdel --force --remove bob? (Choose TWO correct answers.)

   Select 2 answers.

   • A. The user bob is removed from the system's user database.
   • B. The user bob's home directory is removed.
   • C. The locate database is updated to drop files owned by bob.
   • D. All files owned by bob are remove from all mounted filesystems.
   • E. In case bob was the last member of a group, that group is deleted.
   Reveal Answer

9. Question #9

   Given a file called birthdays containing lines like: YYYY-MM-DD Name 1983-06-02 Tim 1995-12-17 Sue Which command would you use to output the lines belonging to all people listed whose birthday is in May or June?

   • A. grep '[56]' birthdays
   • B. grep 05?6? birthdays
   • C. grep '[0-9]*-0[56]-' birthdays
   • D. grep 06 birthdays | grep 05
   Reveal Answer

10. Question #10

    How many IP-addresses can be used for unique hosts inside the IPv4 subnet 192.168.2.128/28? (Specify the number only without any additional information.)

    Type your answer, then reveal.

    Reveal Answer