Free Practice Linux Foundation LFCS Exam Questions 2025

Stay ahead with 100% Free LINUX FOUNDATION CERTIFIED SYSTEM ADMINISTRATOR (LFCS) LFCS Dumps Practice Questions

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Total 260 Questions | Updated On: Apr 24, 2025

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Question 1

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

Answer: C

Question 2

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.

Answer: C

Question 3

What is a purpose of an SSH host key?

A : It must be sent by any SSH client in addition to a user key in order to identify the client's host.

B : It provides the server's identity information to connecting SSH clients.

C : It is the root key by which all user SSH keys must be signed.

D : It authenticates any user that logs into a remote machine from the key's host.

E : It is used by system services like cron, syslog or a backup job to automatically connectto remote hosts.

Answer: B

Question 4

Which of the following statements is correct regarding the command foo 1> bar?

A : The stdout from the command foo is appended to the file bar.

B : The stdout from the command foo overwrites the file bar.

C : The commandfoo receives its stdin from the file bar.

D : The command foo receives its stdin from the stdout of the command bar.

E : The stderr from the command foo is saved to the file bar.

Answer: B

Question 5

Which of the following commands is used to change options and positional parameters for

a runningBash?

A : history

B : set

C : bashconf

D : setsh

E : envsetup

Answer: B

Page: 1 / 52

Total 260 Questions | Updated On: Apr 24, 2025

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