I'm doing in Ubuntu 12

alex@ubuntu:~/folder$ lsof -t -i:3000
4469
alex@ubuntu:~/folder$ kill 4469
alex@ubuntu:~/folder$ lsof -t -i:3000
4469

What did I do wrong?

2

3 Answers

kill -9 4469 

or

 fuser -k -n tcp 3000

3000 is the port number

or Use killport command :

wget
killport 3000 

I know this is old, but I found this useful to me as well. Combining the lsof command from your question and the kill-9 from Abdennour TOUMI's answer into a much simpler and quicker one-line command would give the following:

kill -9 `lsof -t i:3000`

Inside of the two bactick (`) keys, you have the lsof -t i:3000 command from before, which gets the process on the port 3000. Then, the kill -9 command kills that process.

Use this command. Replace 8000 with any other port that you want to free up.

sudo fuser -k 8000/tcp

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