Linux Commands

Question 1

pwd

Answer 1

Finds the path of the current working directory.

Question 2

cd

Answer 2

Used to navigate through files and directories.

Question 3

cd ..

Answer 3

Go to the parent directory.

Question 4

cd-

Answer 4

Move to the previous directory.

Question 5

ls

Answer 5

View contents of the current directory.

Question 6

ls -R

Answer 6

List contents of current directory and sub-folders.

Question 7

ls -a

Answer 7

List contents of the current directory and show hidden files.

Question 8

ls -al

Answer 8

List contents of the current directory with detailed information like permissions, size, owner, ect.

Question 9

cat

Answer 9

Lists the contents of a file on the standard output (sdout).

Question 10

cp

Answer 10

Copy, copies files from the current directory to a different directory. Format cp ‘file’ ‘new directory’

Question 11

mv

Answer 11

Move, used to move the directory of files, can also be used to rename files.

Question 12

mkdir

Answer 12

Make a directory, used to make a new directory.

Question 13

rmdir

Answer 13

Remove directory, only allows removal of empty directories.

Question 14

rm

Answer 14

Removes files.

Question 15

rm -r

Answer 15

Removes a directory and all the files within.

Question 16

touch

Answer 16

Create a blank new file.

Question 17

locate

Answer 17

Used to find a file, like a search bar in windows file explorer.

Question 18

locate -i

Answer 18

Used to find a file however is case sensitive.

Question 19

find

Answer 19

Used to find files and directories, can be used to find files within a given directory.

Question 20

grep

Answer 20

Let’s you search through all text in a file.

Question 21

sudo

Answer 21

Super-user do, perform an action with root permission.

Question 22

df

Answer 22

Gives a report on the systems disk space usage.

Question 23

du

Answer 23

Used to show how much space a file or directory takes up on a disk however will show block numbers rather than usual size, -h argument shows size unit.

Question 24

head

Answer 24

Used to view the first 10 lines of any text file.

Question 25

tail

Answer 25

Used to display the last 10 lines of any text file.

Question 26

diff

Answer 26

Compare the contents of two files line by line and outputs the lines that do not match.

Question 27

tar

Answer 27

Used to archive multiple files into a tarball.

Question 28

chmod

Answer 28

Used to modify read, write and execute permissions of files and directories.

Question 29

chown

Answer 29

Used to modify the owner of a file.

Question 30

jobs

Answer 30

Displays all jobs and their statuses.

Question 31

kill

Answer 31

Used to force close a program. You can send a signal with this command, there are 64 of them, the common ones are SIGTERM (15) which requests a program to stop then SIGSKILL (9) which forces a program to stop immediately.

Question 32

ping

Answer 32

Used to check the connection to a server. Will send a connection and output the response, if it was successful.

Question 33

wget

Answer 33

Downloads files from the internet when given a link.

Question 34

uname

Answer 34

Short for unix name, will print detailed information about your system.

Question 35

history

Answer 35

Outputs a history of previously entered commands.

Question 36

man

Answer 36

Gives instructions for the given command, for example, man tail will explain what the tail command does.

Question 37

echo

Answer 37

Used to move data into a file, for example ‘echo Hello, my name is Bronson&raquo_space; name.txt’ will put the text into the txt file.

Question 38

zip

Answer 38

Will compress and zip files into a zip archive.

Question 39

unzip

Answer 39

Will unzip files from an archive.

Question 40

hostname

Answer 40

Will return the hostname of the network, adding an -I will display the IP address of the network.

Question 41

useradd

Answer 41

Will add a user to the system.

Question 42

userdel

Answer 42

Will delete a user from the system.