linux如何查看正在使用的端口
# 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
linux查看已使用的端口
netstat -tulpn
检查哪些端口是开放的linux
## if you use linux
sudo ss -tulw