General

Question 1

How to check weather apache is installed?

Answer 1

dpkg -l | grep apache

Question 2

check what os is using?

Answer 2

cat /etc/issue OR cat /etc/*-release

Question 3

verify network IP address?

Answer 3

ifconfig -a

Question 4

verify internet connectivity by running ‘ping’ against a domain name

Answer 4

ping -c 4 eimage4u.com

Question 5

verify machine hostname with what commands?

Answer 5

cat /etc/hostname
cat /etc/hosts
hostname
hostname -f

Question 6

to enable or disable init daemons on run-levels?

Answer 6

sysv-rc-conf

Question 7

To start, stop or verify a service (daemon) run the following commands:

Answer 7

sudo service service_name restart
OR
sudo /etc/init.d/ service_name start|stop|restart|status

Question 8

see server processes, open connections, run the following commands:

Answer 8

ps aux | grep service_name
sudo netstat -tulpn
sudo slof -i

Question 9

to update system, run the following command(s):

Answer 9

sudo apt-get update && sudo apt-get upgrade

Question 10

using one single command to install LAMP on ubuntu server

Answer 10

sudo apt-get install apache2 php5 php5-mysql mysql-client mysql-server

Question 11

Install a package with apt, run the following command(s):

Answer 11

sudo apt-get install nmap

Question 12

remove a package with apt, run the following command(s):

Answer 12

sudo apt-get remove nmap

Question 13

update the package index, run the following command(s):

Answer 13

sudo apt-get update

Question 14

upgrade package, run the following command(s):

Answer 14

sudo apt-get upgrade