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Operating Systems Linux How to easily identify socket given a PID on Linux? Post 302995480 by drysdalk on Thursday 6th of April 2017 06:29:51 AM
Old 04-06-2017
Hi,

The difficult part here would be coming up with a generic solution, since what you need from each netstat output would appear to depend on actual human knowledge of which of the listening ports is the 'correct' one. From a technical perspective, they all are: PID 32538 really is listening on ports 7666 and 38970 on all bound IPs, and on port 13804 on the IP 10.2.228.79 specifically.

So aside from you knowing which of these is the one you want, you'd need some way of identifying something that the ports you're after will actually always have in common, if you want a generic scriptable run-one-command-and-get-the-answer solution. Is there something you would always look for or which would be scriptably identifiable as the signifier of which port was the 'correct' one ? If so, then if you can give a bit more detail we may be able to narrow this down further.

As for the fd command - I've never heard of that one, sorry. Doesn't seem to either be installed or to be an option for installation on any Linux or Solaris system I currently have access to.
 

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SOCKSTAT(1)						    BSD General Commands Manual 					       SOCKSTAT(1)

NAME
sockstat -- list open sockets SYNOPSIS
sockstat [-clh] [-p ports] [-P pid|process] [-U uid|user] [-G gid|group] DESCRIPTION
The sockstat command lists open Internet or UNIX domain sockets. The following options are available: -c Show connected sockets. -l Show listening sockets. -h Show a usage summary. -p ports Only show Internet sockets if either the local or foreign port number is on the specified list. The ports argument is a comma- separated list of port numbers and ranges specified as first and last port separated by a dash. -P pid|process Only show sockets of the specified pid|process. The pid|process argument is a process name or pid. -U uid|user Only show sockets of the specified uid|user. The uid|user argument is a username or uid. -G gid|group Only show sockets of the specified gid|group. The gid|group argument is a groupname or gid. If neither -c or -l is specified, sockstat will list both listening and connected sockets. The information listed for each socket is: USER The user who owns the socket. COMMAND The command which holds the socket. PID The process ID of the command which holds the socket. FD The file descriptor number of the socket. PROTO The transport protocol associated with the socket for Internet sockets, or the type of socket (stream or datagram) for UNIX sockets. LOCAL ADDRESS For Internet sockets, this is the address the local end of the socket is bound to (see getsockname(2)). For bound UNIX sockets, it is the socket's filename. For other UNIX sockets, it is a right arrow followed by the endpoint's filename, or ``??'' if the endpoint could not be determined. FOREIGN ADDRESS (Internet sockets only) The address the foreign end of the socket is bound to (see getpeername(2)). SEE ALSO
netstat(1), protocols(5) HISTORY
The sockstat command appeared in FreeBSD 3.1. AUTHORS
The sockstat command and this manual page were written by Dag-Erling Smorgrav <des@FreeBSD.org>. The sockstat command was ported to Linux by William Pitcock <nenolod@nenolod.net>. BSD
May 18, 2008 BSD
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