BASH: nmap

sudo apt install nmap

# Find range of ips on a LAN
ip a

# Who is on my network? (skip port scan)
nmap -sn 192.168.1.0/24

# What are they doing? (includes ports)
nmap 192.168.1.7

# What are the REALLY doing?
sudo nmap -A 192.168.1.7

"I’ve got a rash, man."