Bash commands to show open TCP listening ports

show-listen-ports.md

# Debian
# Without sudo won't show pids and process names
sudo netstat -tlpn|grep LISTEN

# macOS
# Increase +c for better names visibility
# Without sudo only shows processes of the current user
sudo lsof -i -nP +c 30|grep LISTEN

This works on Windows as well. You'll just need to modify the netstat command a bit, and for grep, you need to have MinGW, Cygwin or Git Bash^* installed. This command can also be called without administrative requirements in cmd.exe.

netstat -a | grep LISTENING

^* - When using Git Bash or Cygwin, I find it best to call grep in the respective terminals.