Question 1

Each entry in a crontab must end with what character?

Options :

A : Tab

B : Space

C : Backslash

D : Newline

Answer: D

Question 2

When the command echo $$ outputs 12942, what is the meaning of 12942?

Options :

A : It is the process ID of the echo command.

B : It is the process ID of the current shell.

C : It is the process ID of the last command executed.

D : It is the process ID of the last command which has been placed in the background.

Answer: B

Question 3

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 4

What is the correct command to extract the contents of the archive file download.bz2?

Options :

A : unpack download.bz2

B : unzip2 download.bz2

C : bunzip2 download.bz2

D : unzip download.bz2

E : uncompress download.bz2

Answer: C

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