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I want to extract the process id of a certain process in order to shut it down. The process is a local web server using a certain port (localhost:3000), and I am currently doing it like this to extract the relevant line:

lsof|grep localhost:3000

but the lsof command is too slow. Is there a faster way to extract the process id?

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lsof -i list just the network connections. – Hanan N. Nov 30 '11 at 10:44
@HananN. I tried it, but it is still very slow. Using netstat as suggested in the answers is much faster. – sawa Nov 30 '11 at 11:06
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lsof is not the slow part, using all the name resolutions and ip resolving is. Make it all numeric and it will go fast. – Marcin Nov 30 '11 at 14:29
@Marcin Your information was actually helpful as much as the answers given. Thank you. – sawa Nov 30 '11 at 16:17
Is there any reason why you can`t use killall pgrep or pkill? – Nils Dec 1 '11 at 20:28
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3 Answers

up vote 7 down vote accepted

Try netstat, I cannot say whether its faster or slower, however.

netstat -tanp | awk '$4 ~ /:8443$/ {sub(/\/.*/, "", $7); print $7}' | sort -u
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I understand to use -p option, Linux requires you to be root user. – Nikhil Mulley Nov 30 '11 at 9:49
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It's definitely faster since netstat only lists network connections (and not all the open files) – Matteo Nov 30 '11 at 9:50
Thank you for the quick and accurate response. I helped me a lot. – sawa Nov 30 '11 at 10:00
up vote 7 down vote

You can put a -n option to lsof and then it remove the DNS resolution, which can accelerate the display

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Yes, that seems to sove the problem, and is helpful. It was partly suggested by Marcin in a comment to my answer. – sawa Dec 1 '11 at 20:15
up vote 1 down vote 
sudo ss -p -l '( sport = :3000 )'|awk -F"," 'NR!=1{print $2}'

This will print the PID of the process listening on 3000

time reports that this completed in 0m0.018s.

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