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Top Forums UNIX for Dummies Questions & Answers Trouble managing ports from the command line Post 302840219 by csorhand on Monday 5th of August 2013 03:05:25 AM
Old 08-05-2013
syregnar86,


is this more on firewall(opening ports/closing ports) or more into UNIX sockets ports? Are your question related to ports like (ftp / ssh / sftp)

You have to make it clear.

Ports are open and closed by applications ( like ftp / ssh / http). If you close the applicaiton it will also close the port.


To view what ports is intended to what application is it located in /etc/services that file specify some of the known ports. some applications are not there but those who are common are indicated in the mentioned file.

To view any existing ports ( ESTABLISHED / LISTENING ports on your unix machine. you can use the unix command NETSTAT

ex:
netstat -an | grep ESTAB

hope that helps.
 

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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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