Ubuntu displays port occupancy, running programs, and forcefully closes a process

ubuntu, display port occupation, display running programs, and force close a process

1. Display the program occupying a certain port

lsof -i:80
lsof -i:5000

2. Display whether a certain program is running, view a running program

ps -aux | grep "paster"
ps -aux | grep apache2

3. Kill a process and force kill a process

kill 211119
sudo kill -s 9 21119