Free Linux Foundation LFCS Exam Questions

Become Linux Foundation Certified with updated LFCS exam questions and correct answers

Page: 1 / 52

Total 260 Questions | Updated On: May 11, 2026

Add To Cart

Question 1

When running the commandsed -e "s/a/b/" /tmp/file >/tmp/fileWhile /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 2

What is true regarding TCP port 23?

A : Port 23 is the well known port for the telnet service which is a plain text protocol that should no longer be used.

B : Port 23 is the well known port for the SSH service which provides secure logins.

C : Port 23 is the well known port for the rlogin service which is SSL secured by default.

D : Port 23 is the well known port for the system login services which are encrypted when the user runs the starttls command in his login shell.

Answer: A

Question 3

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 4

Each entry in a crontab must end with what character?

A : Tab

B : Space

C : Backslash

D : Newline

Answer: D

Question 5

Which of the following environment variables overrides or extends the list of directoriesholding shared libraries?

A : LD_LOAD_PATH

B : LD_LIB_PATH

C : LD_LIBRARY_PATH

D : LD_SHARE_PATH

E : LD_RUN_PATH

Answer: C

Page: 1 / 52

Total 260 Questions | Updated On: May 11, 2026

Add To Cart