see ports in use code example
Example 1: linux how to see ports in use
# Any of the following
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:22 # see a specific port such as 22
sudo nmap -sTU -O IP-address-Here
Example 2: see what ports are in use
Get-Process -Id (Get-NetTCPConnection -LocalPort portNumber).OwningProcess