Chapter 10 exam

Question 1

Error messages generated by commands are sent where by default?

STDERR
STDIN
Log files
STDOUT

Answer 1

STDERR

Question 2

A successful command may, or may not print output to STDOUT.
True or False?

True
False

Answer 2

True

Question 3

Which of the following commands will direct error messages to the file, error.log?

ls /root&raquo_space; error.log
ls /root > error.log
ls /root 2> error.log
ls /root $> error.log

Answer 3

ls /root 2> error.log

Question 4

A pipe allows you to…

…send the same input to multiple commands.
…type multiple commands at one prompt.
…send the output of one command to another.
…send the output of a command to a file.

Answer 4

…send the output of one command to another.

Question 5

Channel 2 is:

STDOUT
STDALL
STDERR
STDIN

Answer 5

STDERR

Question 6

Which of the following commands will append its output to output.file?

echo Testing&raquo_space; output.file
echo Testing > output.file
output.file < echo Testing
echo Testing -> output.file

Answer 6

echo Testing&raquo_space; output.file

Question 7

Which command(s) can be used to sort the lines of list.file alphabetically and display it on the screen?
(choose two)

sort < list.file
cat list.file&raquo_space; sort
echo list.file > sort
cat list.file | sort

Answer 7

sort < list.file

cat list.file | sort

Question 8

Which option of the head command will display only the first five lines of a file?

No option needed; head displays only five lines by default.

• n
• l 5
• n 5

Answer 8

-n 5

Question 9

The grep command…

…will display all the lines that begin with the specified Regular Expression.
…will display all the lines in a file containing the specified Regular Expression.
…will display the line numbers in a file that contain a specified Regular Expression.
…is not case sensitive.

Answer 9

…will display all the lines in a file containing the specified Regular Expression.

Question 10

The grep command can be used with glob characters.
True or False?
True
False

Answer 10

True

Question 11

Which of the following commands will display only lines that begin with start?

grep \start file.txt
grep $start file.txt
grep *start file.txt
grep ^start file.txt

Answer 11

grep ^start file.txt

Question 12

Which of the following commands will display only lines that begin with test?

grep $test* file.txt
grep *test file.txt
grep &test file.txt
grep ^test file.txt

Answer 12

grep ^test file.txt

Question 13

Which of the following commands will display lines that contain either start or end?

egrep ‘start|end’ file.txt
egrep (start|end) file.txt
egrep start end file.txt
egrep start&end file.txt

Answer 13

egrep ‘start|end’ file.txt

Question 14

Which of the following commands can be used to scroll through a text file?
(choose two)

some
more
cat
less

Answer 14

more

less

Question 15

Which option for the cut command is used to specify a delimiter?

-D
-f
=
-d

Answer 15

-d

Question 16

Which option for the cut command is used to specify the field?

-d
#
-D
-f

Answer 16

-f

Question 17

Which option for the wc command will print the number of lines in a file?

• w
• l
• L
• C

Answer 17

-l

Question 18

Which option for the wc command will print the total number of words in a file?

• l
• C
• L
• w

Answer 18

-w

Question 19

Which command can be used to print line numbers?

num
nl
ln
sort

Answer 19

nl

Question 20

The command echo “text” > file.txt will create file.txt if it does not already exist.
True or False?

True
False

Answer 20

True

Question 21

The command echo “text” > file.txt will not overwrite file.txt if it already exists.
True or False?

True
False

Answer 21

False

Question 22

The command echo “text”&raquo_space; file.txt will not overwrite file.txt if it already exists.
True or False?

True
False

Answer 22

True