Users

Get root user

su root OR sudo -s

Get current debian version

less /etc/debian_version

Show users: less /etc/passwd

kacperbak:x:1000:1000:Kacper Bak,,,:/home/kacperbak:/bin/bash

Show users: less /etc/group

sudo:x:27:kacperbak
kacperbak:x:1000:

Network

Show open ports

sudo netstat -tulpn

Show firewall status

sudo ufw status