Chapter 10 Netacad Linux

Which option for the cut command is used to specify a delimiter? -D -f = -d

-d

Which option for the cut command is used to specify the field? -d # -D -f

-f

Which option for the wc command will print the number of lines in a file? -w -l -L -C

-l

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

-n 5

Which option for the wc command will print the total number of words in a file? -l -C -L -w

-w

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.

...send the output of one command to another.

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.

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

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

False

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

More Less

Channel 2 is: STDOUT STDALL STDERR STDIN

STDERR

Error messages generated by commands are sent where by default? STDERR STDIN Log files STDOUT

STDERR

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

True

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

True

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

True

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

True

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

echo Testing >> output.file

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

egrep 'start|end' file.txt

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

grep ^start file.txt

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

grep ^test file.txt

Which of the following commands will direct error messages to the file, error.log? ls /root >> error.log ls /root > error.log ls /root 2> error.log ls /root $> error.log

ls /root 2> error.log

Which command can be used to print line numbers? num nl ln sort

nl

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

sort < list.file cat list.file | sort