find out which procses is using port linux
sudo lsof -i:<port_number>
find out which procses is using port linux
sudo lsof -i:<port_number>
linux query port use by pid
$ sudo ss -lptn 'sport = :80'
State Local Address:Port Peer Address:Port
LISTEN 127.0.0.1:80 *:* users:(("nginx",pid=125004,fd=12))
LISTEN ::1:80 :::* users:(("nginx",pid=125004,fd=11))
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