Lsof Cheat Sheet

$ kill -9 `lsof -t -u apache`
$ kill -9 $(lsof -t -i :8080)

$ lsof +D /var/log # Within a directory

$ lsof /var/log/messages
$ lsof /etc/passwd

$ lsof -p 1753
$ lsof -p ^3 # Except certain pids

$ lsof -i 4 # IPv4 only
$ lsof -i 6 # IPv6 only

$ lsof -u www-data
$ lsof -u www-data -u ubuntu
$ lsof -i -u ^root # Except certain user

$ lsof -c mysql
$ lsof -c java
$ lsof -c ssh
$ lsof -c nginx
$ lsof -c ssh -c httpd

$ lsof -i :8080
$ lsof -i :80 -i :22
$ lsof -i TCP:22
$ lsof -i TCP:1-1024
$ lsof -i UDP
$ lsof -i @192.168.1.5

lsof meaning LiSt Open Files is used to find out which files are open by which process

$ lsof
$ sudo lsof -u root