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lsof: lists open files


Show all connections with -i

lsof -i

Show only TCP (works the same for UDP)

lsof -iTCP

-i :port shows all networking related to a given port

lsof -i :22

To show connections to a specific host, use @host

Show connections based on the host and the port using @host:port

Grepping for "LISTEN" shows what ports your system is waiting for connections on

lsof -i| grep LISTEN

Grepping for "ESTABLISHED" shows current active connections

lsof -i| grep ESTABLISHED

Show what a given user has open using -u

lsof -u daniel

See what files and network connections a command is using with -c

lsof -c syslog-ng

Pointing to a file shows what's interacting with that file

lsof /var/log/messages

The -p switch lets you see what a given process ID has open, which is good for learning more about unknown processes

lsof -p 10075

The -t option returns just a PID

lsof -t -c Mail

Using-a allows you to combine search terms, so the query below says, "show me everything running as daniel connected to"

lsof -a -u daniel -i @

Using the -t and -c options together you can HUP processes

kill -HUP `lsof -t -c sshd`

You can also use the -t with -u to kill everything a user has open

kill -9 `lsof -t -u daniel`

lsof +L1 shows you all open files that have a link count less than 1, often indicative of a cracker trying to hide something

lsof +L1

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Page last modified on February 20, 2007, at 02:17 AM