Centos 7 Common Commands

Question 1

sudo

Answer 1

Runs a command as Super User

Question 2

yum

Answer 2

Lets you install software and packages

Question 3

ls

Answer 3

List Directory Contents

Question 4

cd

Answer 4

Change Directory

Question 5

pwd

Answer 5

Display pathname

Question 6

mv

Answer 6

Rename or move files

Question 7

mkdir

Answer 7

Make Directory

Question 8

rm

Answer 8

Delete files or folders

Question 9

who

Answer 9

Checks who is logged on

Question 10

systemctl

Answer 10

Manages OS services and start-ups

Question 11

firewall-cmd

Answer 11

CentOS Firewall

Question 12

nano

Answer 12

Text editor

Question 13

tar

Answer 13

Unzips tar archives(+more)

Question 14

unzip

Answer 14

Unzips an archived folder

Question 15

chmod

Answer 15

Change file permissions

Question 16

chown

Answer 16

Changes owner of a file or folder

Question 17

Python -m SimpleHTTPServer

Answer 17

Creates a simple web page for the current working directory over port 8000.

Question 18

mtr

Answer 18

A command which is a combination of ‘ping’ and ‘traceroute’ command

Question 19

Ctrl+x+e

Answer 19

This key combination fires up, an editor in the terminal, instantaneously.

Question 20

nl

Answer 20

Outputs the content of text file with lines Numbered.

Question 21

shuf

Answer 21

Randomly selects line/file/folder from a file/folder.

Question 22

ss

Answer 22

Outputs Socket Statistics.

Question 23

Last

Answer 23

Want to know history of last logged in users? This command comes to rescue here.

Question 24

curl ifconfig.me

Answer 24

Shows machine’s external IP Address.

Question 25

tree

Answer 25

Prints files and folders in tree like fashion, recursively.

Question 26

Pstree

Answer 26

prints running processes with child processes, recursively.