Linux

Question 1

Default text Editor

Answer 1

Vim

Question 2

Syntax to Launch Vim

Answer 2

vi FileName

Question 3

:w

Answer 3

write

Question 4

:q

Answer 4

Quit editor

Question 5

:!

Answer 5

Exit editor

Question 6

:wq!

Answer 6

Write/save, Quit, and Exit

Question 7

yy

Answer 7

yy: copy line
p: paste line

Question 8

x

Answer 8

Delete character

Question 9

dd

Answer 9

delete line

Question 10

whoami

Answer 10

check active user name

Question 11

id

Answer 11

user id

Question 12

Root user/super user

Answer 12

The root user has no restriction and can perform ay task.

However, a root user can elevate an ordinary user by granting them sudo privileges by making an entry into SUDO /etc/sudoers file. so they can

they can now perform tasks by prefixing their commands by sudo

1. Install packages
2. Make configuration changes
3. make network changes
4. Elevate permissions

Question 13

Curl or wget

Answer 13

curl or wget.http://xhejfkldwsjnwhedasj/file -o Filename.txt

the -o flag is to specify storage location.

Question 14

ssh @user ipaddress

Question 15

check os version

Answer 15

/etc/release

Question 16

RPM (Redhat package manager)

Answer 16

Granular package installation

Question 17

Yum installer

Answer 17

wholistic package installer, just like brew for GNU. It finds dependencies, repos and package components.
Under the hood, yum uses RPM

Question 18

~yum repolist

Answer 18

location of files where package repos are stored

Question 19

ls etc/yum.repos.d/

Answer 19

to see the list or package repos

Question 20

Services

Answer 20

enables programs to start automatically when rebooted, as well as start in the right order

Question 21

system ctl

Answer 21

command to start, enable stop system services:

enable: start upon reboot, or program restart due to failure

system ctl command can be run before configuration

Question 22

cat /proc/sys/net/ipv4/ip_forward

Answer 22

check ip forwarding status
this can either be st to 0 or 1 using the $echo command

Question 23

$ ip route || ifconfig

Answer 23

check route table entries

Question 24

$ ip link

Answer 24

to list and modify links on the host

Question 25

$ ip addr

Answer 25

to see ip address on the interfaces

Question 26

$ ip route add

Answer 26

to add entries into route table

Question 27

Network settings validity

Answer 27

all Network settings are only valid within a boot Lifecycle

Question 28

$ rmdir vs $ rm

Answer 28

The rmdir command is used to remove empty directories only and does not have a recursive option like rm -r for removing directories and their contents.

Question 29

sudo can enable root

Question 30

$ sudo chmod 444

Answer 30

enables read-only mode for all users on a particular file

Question 31

$ cat >> vs $ cat >

Answer 31

// cat >> for appending content to an existing file for creating or overwriting a file with content/string // use of the command cat >