Linux 1

Question 1

Halt

Answer 1

This command shuts down the operating system but can be run only by the root user.

Question 2

Reboot

Answer 2

This command shuts down and restarts the operating system. It also can be run only by root.

Question 3

Init 0

Answer 3

This command also shuts down the operating system and can be run only by your root user.

Question 4

Init 6

Answer 4

This command also shuts down and restarts the operating system. It also can be run only by root.

Question 5

Shutdown.

Answer 5

This command can be used by root to shut down or reboot the system.

Question 6

Exit

Answer 6

This command terminates the currently running process, including the current shell session.

Question 7

Su

Answer 7

Switch user. This command switched from the current user to a new user account.

Question 8

Env

Answer 8

This command displays the environment variables for the currently logged-in user.

Question 9

Echo

Answer 9

This command is used to echo a line of text on the screen.

Question 10

Top

Answer 10

Displays a list of all applications and processes currently running on the system.

Question 11

Which

Answer 11

Displays the full path to a shell command or utility.

Question 12

Whoami

Answer 12

Displays the username of the current logged-in user.

Question 13

Netstat

Answer 13

Displays the status of the network, including current connections, touring tables, and so on.

Question 14

Route

Answer 14

View or manipulate the systems routing table.

Question 15

Ifconfig

Answer 15

Manage network boards installed in the system. Can only be run by the root user.

Question 16

Unamed

Answer 16

Returns information about your Linux system.

Question 17

-s

Answer 17

Linux’s kernel name

Question 18

-n

Answer 18

System’s hostname

Question 19

-r

Answer 19

Linux’s kernel’s release number.

Question 20

-v

Answer 20

Linux kernel’s version number

Question 21

-m

Answer 21

System’s hardware architecture (x86-64)

Question 22

-p

Answer 22

Processor type

Question 23

-I

Answer 23

Hardware platform.

Question 24

-o

Answer 24

Operating system

Question 25

-a

Answer 25

Displays all information.

Question 26

Histsize or histfilesize

Answer 26

Configure the size of your history file.

Question 27

Histcontrol

Answer 27

Controls how your command history is stored. Variable can be set to a value of ignoredups, ignoredspace, ignoreboth, or eraseups.

Question 28

Ignoreups

Answer 28

Ignore duplicates in history

Question 29

Ignorespace

Answer 29

Ignore commands that start with spaces.

Question 30

Ignoreboth

Answer 30

Specifies ignorespace and ignoreups.

Question 31

Eraseups

Answer 31

Remove all duplicate entries in the history file.

Question 32

MANPATH

Answer 32

echo $MANPATH

Question 33

echo $SHELL

Answer 33

Find default shell

Question 34

ls

Answer 34

List directory

Question 35

ls -l

Answer 35

Long list

Question 36

echo $PATH

Answer 36

Current users PATH variable.

Question 37

Exec

Answer 37

Execute file

Question 38

man -kan

Answer 38

Search across all man page names and descriptions to find a specific keyword

Question 39

rmdir

Answer 39

Remove directory

Question 40

apropos

Answer 40

Search man pages

Question 41

info

Answer 41

Info pages

Question 42

variable=value

Answer 42

Change variable.

Question 43

alias name=command

Answer 43

Change name of command | alias ldir="ls -l"

Question 44

Redirect output

Answer 44

command output > filename

Question 45

Redirect output without erasing data

Answer 45

command output >> filename

Question 46

Redirect stderr and stdout to text files.

Answer 46

command 1> stdout_filename 2> stderr_filename

Question 47

Redirect input

Answer 47

command < input_text_or_file

Question 48

Piping

Answer 48

command | grep expression | cat /var/log/messages | more

Question 49

Display command on screen and write to a file

Answer 49

command | tee file_name | ls -l | tee output.txt

Question 50

Text editor

Answer 50

vi filename.txt

Question 51

Insert text in vi

Answer 51

``` I Insert S O A ```

Question 52

Enter command line mode in vi

Answer 52

w filename

Question 53

Exit

Answer 53

Writes the current file and then closes vi

Question 54

wq

Answer 54

Also writes the current file to disk and closes vi.

Question 55

q

Answer 55

Closes vi without saving the current file. This can be used only if the filename hasn't been changed. If the file has been changed enter q!

Question 56

w!

Answer 56

Overwrites the current file

Question 57

e!

Answer 57

Forgets changed since the last write.

Question 58

dw

Answer 58

Deletes the word that comes immediately after the cursor, including the space

Question 59

de

Answer 59

Deletes the word that comes immediately after the cursor not including the space.

Question 60

d$

Answer 60

Deletes from the insertion point to the end of the line.

Question 61

dd

Answer 61

Deletes the entire current line

Question 62

p

Answer 62

Inserts the text deleted in the last deletion operation after the current cursor location

Question 63

u

Answer 63

Undoes the last action

Question 64

D

Answer 64

Deletes the rest of the current line from the cursor position.

Question 65

yy

Answer 65

Copies the line in which the cursor is located on the buffer

Question 66

a

Answer 66

Append after cursor

Question 67

A

Answer 67

Append after line

Question 68

C

Answer 68

Change to the end of the line.

Question 69

cw

Answer 69

Change the current word with new text, starting with the the character under the cursor, until ESC is hit

Question 70

cc

Answer 70

Change the whole line

Question 71

ZZ

Answer 71

Saves the current file and ends vi

Question 72

h

Answer 72

Moves the cursor left one character.

Question 73

j

Answer 73

Moves the cursor down one line

Question 74

k

Answer 74

Moves the cursor up one line

Question 75

l

Answer 75

Moves the cursor right one

Question 76

0

Answer 76

Moves the cursor to the start of the current line

Question 77

CTRL-G

Answer 77

Displays a status line at the bottom of the interface. Displays the name of the file, the total number of lines in the file, and the current cursor location.

Question 78

/search_term

Answer 78

Searches for the next instance of the term specified. /5901

Question 79

?/search_term

Answer 79

Searches for the previous instance of the term specified.