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?

Options :

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?

Options :

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 true regarding TCP port 23?

Options :

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 4

How can the normal output of a command be written to a file while discarding the error output?

Options :

A : command >2>file 1&>/dev/null

B : command < output > /dev/null

C : command > discard-error > file

D : command > /dev/null 2&>1 output

E : command >file 2>/dev/null

Answer: A

Question 5

Which of the following commands reboots the system when using SysV init? (Choose TWO

correct answers.)

Options :

A : shutdown -r now

B : shutdown -r "rebooting"

C : telinit 6

D : telinit 0

E : shutdown -k now "rebooting"

Answer: A,C