To find out what processes are using a specific port, use lsof
.
lsof -i :PORT
Examples
List all processes using the 5432 port (commonly used by postgres)
$ lsof -i :5432
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
postgres 777 1ma 7u IPv6 0x0123456789abcdef 0t0 TCP localhost:postgresql (LISTEN)
postgres 777 1ma 8u IPv4 0x1123456789abcdef 0t0 TCP localhost:postgresql (LISTEN)
List all processes using the 4000 port (this blog in development)
$ lsof -i :4000
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
ruby 59182 1ma 10u IPv4 0x2123456789abcdef 0t0 TCP localhost:terabase (LISTEN)
Alternatives
netstat
can be used with grep to look for the port, but not possible in macOS as netstat
won't output the process ID.
ps -ef
can be used with grep too, but we'll need some bash sorcery to keep the first line of the ps
output (the headers line).
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