Linux commands

Question 1

ls

Answer 1

displays the contents of a directory

Question 2

grep

Answer 2

search for regular expressions in a text file

Question 3

cd

Answer 3

change the current directory

Question 4

shutdown

Answer 4

shuts down the system

Question 5

pwd

Answer 5

print working directory tells you where you are in the filesystem

Question 6

passwd

Answer 6

change the login credentials of a specific user

Question 7

mv

Answer 7

rename a file and move the file from one directory to andother

Question 8

cp

Answer 8

copy files

Question 9

rm

Answer 9

(remove) delete files

Question 10

chmod

Answer 10

change file permission, change the mode of a file system object.

Question 11

chown

Answer 11

change file owner and group

Question 12

iwconfig

Answer 12

view and change information related to the wireless networking configurations

Question 13

ifconfig

Answer 13

view and change information related to the networking configuration

Question 14

ps

Answer 14

display a list of currently running processes, view the process ID of an application

Question 15

apt-get

Answer 15

download files from a repository, install a specific utility

Question 16

vi

Answer 16

Edit a file in the visual file editor

Question 17

dd

Answer 17

backs up and restores a partition and copies, blocks of data from one file to another,
creates a disk image of a Linux partition

Question 18

kill

Answer 18

if you want to terminate a particular process running on the system (used with PID numbers)

Question 19

su (username)

Answer 19

switching to another user in Terminal

Question 20

sudo (command)

Answer 20

executes one command in privileged mode