Linux Ch. 10

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

-d

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

-f

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

-l

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

-n 5

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

-w

A pipe allows you to...

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

The grep command...

...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. T/F?

False

Channel 2 is:

STDERR

Error messages generated by commands are sent where by default?

STDERR

A successful command may, or may not print output to STDOUT. T/F?

True

The command echo "text" > file.txt will create file.txt if it does not already exist. T/F?

True

The command echo "text" >> file.txt will not overwrite file.txt if it already exists. T/F?

True

The grep command can be used with glob characters. T/F?

True

Which of the following commands will append its output to 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

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

grep ^start file.txt

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

grep ^test file.txt

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

ls /root 2> error.log

Which of the following commands can be used to scroll through a text file?

more & less

Which command can be used to print line numbers?

nl

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

sort < list.file & cat list.file | sort