Review questions

Question 1

What are SSH keys? What are the purpose of them?

Answer 1

SSH keys are created using public key cryptography and is used to verify your identity when making an ssh connection to another server.

Question 2

Where are SSH keys in the local machine? server?

Answer 2

local machine = ~/.ssh
server = ~/.ssh/authorized_keys

Question 3

What commands create ssh keys?

Answer 3

ssh-keygen

(useful flags: -t to specify which encryption method, -f for folder location for key)

Question 4

How does the ssh command work?

Answer 4

provide identity file with -i, user to login as and ip address of server

ie ssh -i /path/to/key root@123.342.234

Question 5

How to move up, down, right, left in nvim?

Answer 5

h-left
j- down
k- up
l-right

Question 6

How do you move to the top of the buffer in nvim?

Answer 6

gg

Question 7

How do you move to the bottom of the buffer in nvim?

Answer 7

G

Question 8

How do you move to the start of a line in nvim?

Answer 8

0

Question 9

How do you move to the end of a line in nvim?

Answer 9

$ (or A to move it at the end and into insert mode)

Question 10

What are the four basic nvim modes?

Answer 10

1. Insert (I)
2. Command (:)
3. Visual (v)
4. Replace (R)

Question 11

How to force quit in nvim?

Answer 11

:q!

Question 12

How to save in nvim?

Answer 12

:w

Question 13

/etc

Answer 13

configuration files

Question 14

/usr

Answer 14

contains system-wide, read-only files

Question 15

/bin

Answer 15

Holds binary files like important commands

Question 16

/home

Answer 16

home dir for all users

Question 17

what is cloud-init? what is its purpose?

Answer 17

It is configuration file written in YAML for web server creation, allows for the quick setup of servers by providing pre configurations that can install packages, create users, restrict certain actions etc

Question 18

What is a process?

Answer 18

a program loaded into memory and is running

Question 19

In what order is commands read by the shell?

Answer 19

1. Shell functions 2. Shell built ins 3. Path var

Question 20

what does ps -e do

Answer 20

shows all running processes

Question 21

what does ps -o do

Answer 21

alters the output by specifying desired columns
i.e. ps -o pid

Question 22

How do you search for files?

Answer 22

find dir [options] pattern
ie find . -type f -name file1

Question 23

How do you search for a pattern inside a file?

Answer 23

grep [options] pattern filepath

ie grep -i [abc] file1

Question 24

How do you create enviromental variables?

Answer 24

exporting a regular var will turn it into a environmental variable
i.e. export ENV_VAR