Killing a PID which is using a port

Question

I am using below code to kill a process which is using a port number

port = sudo lsof -n -i4TCP:3030 | grep LISTEN | awk '{print $2;}'
if [ ! -z "$port" -a "$port" != " " ]; then
   sudo kill "$port"
fi

But it is saying port: command not found . What is causing the issue and how can I fix it.

Answer 1

As it stands,

port = sudo lsof -n -i4TCP:3030 | grep LISTEN | awk '{print $2;}'

attempts to run a command port with parameters = sudo lsof -n -i4TCP:3030 and pipe its output through grep LISTEN and then awk '{print $2;}' .

Use

port=$(sudo lsof -n -i4TCP:3030 | grep LISTEN | awk '{print $2;}')

Answer 2

没有理由自己动手：Linux上的fuser将通过一个命令为您完成此任务，并且效率更高：

sudo fuser -n tcp -k 3030

Answer 3

只需一行！

sudo kill `sudo lsof -t -i:3030`