To look for files that have been opened by internet or network connections associated with the ssh process, use the following command:.
We can make lsof report on the files that were opened by internet or network connections on a specific port. To do this, we use the : character followed by the port number.
All of the listed files were opened by processes associated with port 22 which is the default port for SSH connections. We can ask lsof to show the files that have been opened by processes associated with network and internet connections, that are using a specific protocol.
Just how much more can be judged by the fact the man page is over 2, lines long. The lsof command can be used to drill ever deeper into the strata of open files and pseudo-files.
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If you use lsof command without any options and arguments, it will list all opened files by all the processes in the system. There are over eleven thousand files opened by various processes in the system. This comes handy in a multi-user environment. You can list all the files opened by a certain user in the following manner:. The search is recursive. So it will list all the opened files in the mentioned directory and all of its sub-directories.
You need to know the process id pid in this case. If you know the process id, you can use the -p option of the lsof command to find the files opened by it. This is specially helpful in debugging.
Suppose you want to see what files are used by http daemon, you just need to specify the command name httpd in our example. You can combine options like user and command and a process using the —a option. Think of it as the AND operator. This gives you an additional filter while trying to narrow down on your search.
You can also specify the network connection type. For example, to list all the opened TCP ports, you can use:. For example, you want to list all the files opened by a user other than root, use it in this manner:.
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