{{{#!highlight sh
# List all open files
lsof

# Processes using a file? (fuser equivalent)
lsof /path/to/file

# Open files within a directory
lsof +D /path

# Files by user
lsof -u name
lsof -u name1,name2
lsof -u name1 -u name2

# By program name
lsof -c apache

# AND'ing selection conditions
lsof -u www-data -c apache

# By pid
lsof -p 1

# Except certain pids
lsof -p ^1

# TCP and UDP connections
lsof -i
lsof -i tcp # TCP connections
lsof -i udp # UDP connections

# By port
lsof -i :25
lsof -i :smtp
lsof -i udp:53
lsof -i tcp:80

# All network activity by a user
lsof -a -u name1 -i

lsof -N # NFS use
lsof -U # UNIX domain socket use

# List PIDs
lsof -t -i
kill -9 $(lsof -t -i) # Kill all programs w/network activity
}}}
----
CategoryCheatSheet