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:
I'm pretty sure I'm missing something. Thanks for any suggestions
TCP connections do communicate in both directions.
If you're wondering which server initiated the connection(i.e. did you connect to them, or they to you?) you can check the port number. Connections you created to something else should have random, high port numbers between 32768 and 65535 on your end of the connection, and low port numbers on their end. (http is port 80, imaps is 993 -- you'll find the names in /etc/services).
So it looks like you initiated all these connections, some to websites, some to email.
Thanks for the quick reply. I am using the Skype incoming port to filter the output of lsof(in my script) I guess it doesn't matter who started the connection, just that it is active. since TCP connections do communicate in both directions. Here are a couple examples from skype. I didn't connect to anyone here, but these are the servers it connects to automatically when it starts up:
Skype is an evil little thing when it comes to network security. Since it might be used in very restricted environments it keeps a list of public accessible servers to route calls through, and receives an updated list each time it connects. So those are probably the connections you're seeing.
Hi,
I am trying to find the files in a specific directory that are currently in open state. I need this information to archive the old files that are not active in the directory.
I get the following output when I try the command $ lsof +d '/var/tmp/'|awk '{print $9}'|sort -u
NAME... (1 Reply)
In Linux and Solaris lsof accepts the -X switch which allows to see if deleted files are still in use and eat disk space. In HP-UX it is now working and it is a problem... today one of my filesystems on the server was increasing very fast but existing file sizes were not really changing. lsof shows... (3 Replies)
Hi,
I typed lsof -i :80 in my putty but i am not able to get sockets related to port 80
Can any one help me out soon
Can anyone point out the reason for not able to get the related sockets
Output of what i am getting in my putty is displayed below
training@use:~> lsof -i :80... (4 Replies)
I'm looking to list all of the files open at a certain time up on a UNIX box.
From looking on the internet, it looks as though lsof is the most common.
However have tried this and got the following:
ksh: lsof: not found
Now having gone into bash mode and hit tab twice I see that lsof... (3 Replies)
Hi ..
I have written a cronjob to invoke a script that would transfer files based on some criteria.
Consider folders A and B. Say I FTP a large file to A. Before the file gets fully transfered say the cronjob gets invoked. The script will move the file before its fully transfered. To detect... (1 Reply)
Hi All,
I'm having a problem with "lsof" in HP-UX system. Its giving me 2 two different results when running it.
1 . lsof -p 'PID' | wc -l -----gives some value
2 . lsof | grep 'PID' | wc -l
The above two commands gives me two different values with the same PID......
Thanks (6 Replies)
hello
Sorry but i don't understand very well the lsof command with the man.
Can you explain to me what is the use of this command ?
thank you (2 Replies)