Files opened by processes running on your system.
List all opened internet sockets.
# lsof -i
List all opened internet sockets on port 80.
# lsof -i :80
List all udp or tcp connections.
# lsof -i udp # lsof -i tcp # lsof -i tcp:80
Files open by PID.
# lsof -p 4455
List all open files EXCEPT process with PID.
# lsof -p ^1
Files open by the application httpd.
# sudo lsof /usr/sbin/httpd # sudo lsof `which httpd`
FIles open by name.
The -c option searches for a pattern. For example, i used the letter “h” below which will show you all processes that start with the letter “h”.
# lsof -c h # lsof -c httpd # lsof -c Dropbox # lsof | grep httpd # lsof -c bash
Shows all processes that have a TCP connection opened to or from the host ractivate.adobe.com at port 49154.
# lsof -iTCP@practivate.adobe.com:49154
Shows a list of open files ran by user.
# lsof -u tommy # lsof -u _www # lsof -u root
Shows a list of open files EXCEPT ran by the user root.
# lsof -u ^root
Files open in a directory.
# lsof +D /Users/Tommy
List all UNIX domain sockets.
# lsof -U
List by group id.
# lsof -g 1597
List NFS files.
# lsof -N
The -t option outputs only PIDs of processes. Used together with -i it outputs PIDs of all processes with network connections. This allows you to kill all processes that use network.
# kill -9 `lsof -t -i`
Repeat listing files every 1 second.
# lsof -r 1
The -r option makes lsof repeatedly list files until interrupted. Argument 1 means repeat the listing every 1 second. This option is best combined with a narrower query such as monitoring user network file activity:
# lsof -r 1 -u john -i -a
Mac OS X, lsof only shows your own processes unless running as root with sudo.