Tired of always googling commands for tasks (e.g., check if port is open)? A cheatsheet is all you need!
sudo lsof -i -n -P | grep YOUR_PORT_NUMBER
nmap -Pn -p PORT_NUMBER 192.168.1.0/24 | grep HOST_NAME
tcpdump -i any -w PCAP_FILE_PATH host HOST_IP
grep -rl --include="*.txt" "your_string_here" /path/to/search/root/directory