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Full Discussion: Can't tell whether lsof -i connections are coming in or going out
Top Forums UNIX for Dummies Questions & Answers Can't tell whether lsof -i connections are coming in or going out Post 302501196 by chancho on Thursday 3rd of March 2011 12:41:35 AM
Old 03-03-2011
Can't tell whether lsof -i connections are coming in or going out
os x 10.6.6 ,GNU bash, version 3.2.48
I am working on a bash script that displays the IP address of the computer that I am connected to with skype. I have that working pretty well, but only because I know the incoming connection port skype uses.
I used lsof -i and grep for the port and application name

I am wondering how I can tell which connections are incoming and which are outgoing(or do they go both ways?). I see the -> ,but not any <- . Here is a portion of my lsof -i output:
Code:
COMMAND     PID USER   FD   TYPE     DEVICE SIZE/OFF NODE NAME
Mail        237  JOE   21u  IPv4 0x10d4b334      0t0  TCP 10.0.1.2:52726->vw-in-f109.1e100.net:imaps (ESTABLISHED)
Mail        237  JOE   23u  IPv4 0x1e120680      0t0  TCP 10.0.1.2:64309->qy-in-f109.1e100.net:imaps (ESTABLISHED)
Mail        237  JOE   29u  IPv4 0x221f16e0      0t0  TCP 10.0.1.2:63060->vx-in-f109.1e100.net:imaps (CLOSE_WAIT)
Mail        237  JOE   31u  IPv4 0x0d708304      0t0  TCP 10.0.1.2:58581->qw-in-f109.1e100.net:imaps (ESTABLISHED)
Dropbox     181  JOE  25u  IPv4 0x1b6e8aec      0t0  TCP 10.0.1.2:58310->174.36.30.27-static.reverse.softlayer.com:http (ESTABLISHED)

I'm pretty sure I'm missing something. Thanks for any suggestions
 

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LEARN ABOUT LINUX

pldd

PLDD(1) 							 Linux User Manual							   PLDD(1)

NAME

       pldd - display dynamic shared objects linked into a process

SYNOPSIS

       pldd PID
       pldd OPTION

DESCRIPTION

       The  pldd  command  displays a list of the dynamic shared objects that are linked into the process with the specified process ID.  The list
       includes the libraries that have been dynamically loaded using dlopen(3).

OPTIONS

       -?, --help
	      Display program help message.

       --usage
	      Display a short usage message.

       -V, --version
	      Display the program version.

VERSIONS

       pldd is available since glibc 2.15.

CONFORMING TO

       The pldd command is not specified by POSIX.1.  Some other systems have a similar command.

EXIT STATUS

       On success, pldd exits with the status 0.  If the specified process does not exist, the user does not have permission to access its dynamic
       shared  object  list, or no command-line arguments are supplied, pldd exists with a status of 1.  If given an invalid option, it exits with
       the status 64.

EXAMPLE

       $ echo $$	       # Display PID of shell
       1143
       $ pldd $$	       # Display DSOs linked into the shell
       1143:	 /usr/bin/bash
       linux-vdso.so.1
       /lib64/libtinfo.so.5
       /lib64/libdl.so.2
       /lib64/libc.so.6
       /lib64/ld-linux-x86-64.so.2
       /lib64/libnss_files.so.2

NOTES

       The command

	    lsof -p PID

       also shows output that includes the dynamic shared objects that are linked into a process.

SEE ALSO

       ldd(1), lsof(1), dlopen(3), ld.so(8)

GNU
								    2014-09-27								   PLDD(1)
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