Cheat Sheet

Question 1

Opens man pages for the specified tool.

Answer 1

man <tools>

Question 2

Prints the help page of the tool.

Answer 2

<tool> -h

Question 3

Searches through man pages’ descriptions for instances of a given keyword.

Answer 3

apropos <keyword>

Question 4

Concatenate and print files.

Answer 4

cat

Question 5

Displays current username.

Answer 5

whoami

Question 6

Returns users identity.

Answer 6

id

Question 7

Sets or prints the name of the current host system.

Answer 7

hostname

Question 8

Prints operating system name.

Answer 8

uname

Question 9

Returns working directory name.

Answer 9

pwd

Question 10

Used to assign or view an address to a network interface and/or configure network interface parameters.

Answer 10

ifconfig

Question 11

A utility to show or manipulate routing, network devices, interfaces, and tunnels.

Answer 11

ip

Question 12

Shows network status.

Answer 12

netstat

Question 13

Another utility to investigate sockets.

Answer 13

ss

Question 14

Shows process status.

Answer 14

ps

Question 15

Displays who is logged in.

Answer 15

who

Question 16

Prints environment or sets and executes a command.

Answer 16

env

Question 17

Lists block devices.

Answer 17

lsblk

Question 18

Lists USB devices.

Answer 18

lsusb

Question 19

Lists opened files.

Answer 19

lsof

Question 20

Lists PCI devices.

Answer 20

lspci

Question 21

Execute command as a different user.

Answer 21

sudo

Question 22

The utility requests appropriate user credentials via PAM and switches to that user ID (the default user is the superuser). A shell is then executed.

Answer 22

su

Question 23

Creates a new user or update default new user information.

Answer 23

useradd

Question 24

Deletes a user account and related files.

Answer 24

userdel

Question 25

Modifies a user account.

Answer 25

usermod

Question 26

Adds a group to the system.

Answer 26

addgroup

Question 27

Removes a group from the system.

Answer 27

delgroup

Question 28

Changes user password.

Answer 28

passwd

Question 29

Install, remove and configure Debian-based packages.

Answer 29

dpkg

Question 30

High-level package management command-line utility.

Answer 30

apt

Question 31

Alternative to apt.

Answer 31

aptitude

Question 32

Install, remove and configure snap packages.

Answer 32

snap

Question 33

Standard package manager for Ruby.

Answer 33

gem

Question 34

Standard package manager for Python.

Answer 34

pip

Question 35

Revision control system command-line utility.

Answer 35

git

Question 36

Command-line based service and systemd control manager.

Answer 36

systemctl

Question 37

Prints a snapshot of the current processes.

Answer 37

ps

Question 38

Query the systemd journal.

Answer 38

journalctl

Question 39

Sends a signal to a process.

Answer 39

kill

Question 40

Puts a process into background.

Answer 40

bg

Question 41

Lists all processes that are running in the background.

Answer 41

jobs

Question 42

Puts a process into the foreground.

Answer 42

fg

Question 43

Command-line utility to transfer data from or to a server.

Answer 43

curl

Question 44

An alternative to curl that downloads files from FTP or HTTP(s) server.

Answer 44

wget

Question 45

Starts a Python3 web server on TCP port 8000.

Answer 45

python3 -m http.server

Question 46

Lists directory contents.

Answer 46

ls

Question 47

Changes the directory.

Answer 47

cd

Question 48

Clears the terminal.

Answer 48

clear

Question 49

Creates an empty file.

Answer 49

touch

Question 50

mkdir

Answer 50

mkdir

Question 51

Lists the contents of a directory recursively.

Answer 51

tree

Question 52

Move or rename files or directories.

Answer 52

mv

Question 53

Copy files or directories.

Answer 53

cp

Question 54

Terminal based text editor.

Answer 54

nano

Question 55

Returns the path to a file or link.

Answer 55

which

Question 56

Searches for files in a directory hierarchy.

Answer 56

find

Question 57

Updates the locale database for existing contents on the system.

Answer 57

updatedb

Question 58

Uses the locale database to find contents on the system.

Answer 58

locate

Question 59

Pager that is used to read STDOUT or files.

Answer 59

more

Question 60

An alternative to more with more features.

Answer 60

less

Question 61

Prints the first ten lines of STDOUT or a file.

Answer 61

head

Question 62

Prints the last ten lines of STDOUT or a file.

Answer 62

tail

Question 63

Sorts the contents of STDOUT or a file.

Answer 63

sort

Question 64

Searches for specific results that contain given patterns.

Answer 64

grep

Question 65

Removes sections from each line of files.

Answer 65

cut

Question 66

Replaces certain characters.

Answer 66

tr

Question 67

Command-line based utility that formats its input into multiple columns.

Answer 67

column

Question 68

Pattern scanning and processing language.

Answer 68

awk

Question 69

A stream editor for filtering and transforming text.

Answer 69

sed

Question 70

Prints newline, word, and byte counts for a given input.

Answer 70

wc

Question 71

Changes permission of a file or directory.

Answer 71

chmod

Question 72

Changes the owner and group of a file or directory.

Answer 72

chown

Question 73

Go back to the previous directory.

Answer 73

cd ..

Question 74

Simplest way to go to the users Home directory.

Answer 74

cd

Question 75

Way to go to the users Home directory using a special character.

Answer 75

cd ~

Question 76

Way to go to the users Home directory by using an environment variable.

Answer 76

cd $HOME