Question 1

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

Options :

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 2

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 3

Each entry in a crontab must end with what character?

Options :

A : Tab

B : Space

C : Backslash

D : Newline

Answer: D

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

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