Born2beRoot

• How virtual machine works

• Diffrence between centOS and debian

• The purpose of virtual machine

• Diffrence between aptitude and apt

• aptitude is a simulator user-interface for command line.

• What's apt-get

• What's APPArmor

• What's LVM

• What's root

• What's UFW

• What's SSH

• what's diffrence between primary and logical partition

• Primary partition is a bootable partition and it contains the operating system/s of the computer, while logical partition is a partition that is not bootable. Multiple logical partitions allow storing data in an organized manner.

• etc/ssh/sshd_config path where port defined

Commends

• systemctl status ssh to show ssh status
• hostnamectl set-hostname newHostName to change hostname
• groupadd [options] groupName to create group
• getent group to list all groups details
• compgen -g to list all groups names only
• groupdel [options] groupName to delete a group
• useradd [options] newUserName to add a user
• compgen -u to list all users names
• getent passwd to list all users names and details
• userdel [options] userName to delete a user

Favorite commands

• compgen [option required] this great command shorts many stuff that you w'll use grep or cut and thier flags for wich I don't realy preffer