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There is 1 alternative - vote for the best!
A way not so simple but functional for print the command for the process that's listening a specific port.
I got the pid from lsof because I think it's more portable but can be used netstat
netstat -tlnp
If you can do better, submit your command here.
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I don't have Ubuntu to hand, but I'm sure you mean /proc, not /etc.
Also, this won't for things like apache, where several processes all claim to listen to the same port. For that you'd have to turn the list of pids into something like {pid1,pid2,pid3}, or use head to get the first match.
thx flatcap.
corrected to /proc.