QUESTION 11 Some programs take a long time to finish when run, so you would like

ID: 3821022 • Letter: Q

Question

QUESTION 11

Some programs take a long time to finish when run, so you would like to run the command in the background so you can continue to work in your terminal until it finishes.

For example, if you are using the "cc" compiler to compile a very complex program that might take an hour to finish compiling, the command might be "cc big-program.c"

How would you run that program and have it run in the background?

top cc big-program.c

cc big-program.c &

%1 cc big-program.c

cc big-program.c !

QUESTION 12

You can type the "ps ax" command to see information about running programs. You want to capture the output of this command to a file named "running-programs.txt". How would you do that?

stdout ps ax running-programs.txt

ps ax | running-programs.txt

ps ax > running-programs.txt

ps ax ; running-programs.txt

QUESTION 13

When using the less command to view a text file, which key can you press to begin a search?

The spacebar

QUESTION 14

Which directory holds most of the system configuration files in Unix?

/etc

/var

/root

/bin

QUESTION 15

What is the difference between "rm *.html" and "rm * .html"? (the second one has a space between the * and the .html)

They both do the same thing.

Both delete every file in the directory that have filenames that end in .html, but the second one will also delete subdirectories.

c.rm *.html will delete all files that have .html as the end of the file name.

rm * .html will delete all files, and also try to delete a file named only .html

d.The first one will work correctly, but the second one is an invalid command.

QUESTION 16

Which command below accomplishes the roughly same task as the following command? ls /usr/bin/*e

ls /usr/bin | grep 'e$'

grep e$ /usr/bin

ls /usr/bin | grep 'e^'

egrep /e/ /usr/bin

QUESTION 17

Which word below is matched by this search?

.grep '^..m.r$'

walker

tamer

amber

d. tomorrow

QUESTION 18

You want to search a file named govern.txt and return all lines that contain either the word COLLINS or the word PINGREE. Which command would work?

grep -E 'COLLINS|PINGREE' govern.txt

cat govern.txt | grep COLLINS | grep PINGREE

grep COLLINS PINGREE < govern.txt

grep ^N$ govern.txt

QUESTION 19

If you have a file named phone-numbers.txt that looks like this:

207-568-6723
617-277-2343
207-822-9645
603-314-5892
800-233-3413

Doing "sort phone-numbers.txt" will end up sorting by area code.

What if you want to sort by the last 4 numbers?

cat -r phone-numbers.txt | sort -rn

sort -t- -k3 phone-numbers.txt

sort -n phone-numbers.txt

sort [[:allnum:]]$ phone-numbers.txt

QUESTION 20

You have a file named employees.txt with content that you want to convert to all uppercase. Which command would do that for you?

tr [:lower:] [:upper:] < employees.txt

sed s/a-z/A-Z/g employees.txt

tr az AZ < employees.txt

grep [a-z] [A-Z] employees.txt

top cc big-program.c

cc big-program.c &

%1 cc big-program.c

cc big-program.c !

Explanation / Answer

QUESTION 11

For running longer program:

cc big-program.c &

QUESTION 13:

For searching:

a. /

QUESTION 14:

Most of system configuration files are in:

a. /etc

QUESTION 19:

Sorting numbers:

c. sort -n phone-numbers.txt

QUESTION 20:

lower into uppercase:

a. tr [:lower:] [:upper:] < employees.txt