Hoofdstuk 8 meerkeuze

Question 1

Error messages generated by commands are sent where by default?

Log files
STDOUT
STDERR
STDIN

Answer 1

STDERR

Question 2

A successful command will 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?
(choose one)

ls /root >> error.log
ls /root 2> error.log
ls /root $> 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:

STDIN
STDALL
STDOUT
STDERR

Answer 5

STDERR

Question 6

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

echo Testing > 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 | sort
cat list.file >> sort
echo list.file > sort

Answer 7

cat list.file | sort

sort < list.file

Question 8

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

-l 5
No option needed; head displays only five lines by default.
-n
-n 5

Answer 8

-n 5

Question 9

The grep command…

…will display all the lines that begin with the specified Regular Expression.
…is not case sensitive.
…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.

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
less
cat
more

Answer 14

less

more

Question 15

The find command can search for files based on the size of the file.
True or False?

True
False

Answer 15

True

Question 16

Which of the following commands scans the file to determine file locations?

search
locate
where
find

Answer 16

find

Question 17

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

-f
-d
=
-D

Answer 17

-d

Question 18

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

-D
-f
-d
#

Answer 18

-f

Question 19

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

- l
- w
- C
- L

Answer 19

-l

Question 20

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

- l
- L
- C
- w

Answer 20

-w

Question 21

Which command can be used to print line numbers?

num
sort
ln
nl

Answer 21

nl

Question 22

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

True
False

Answer 22

True

Question 23

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

True
False

Answer 23

False

Question 24

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

True
False

Answer 24

True