YSK about [Unix tools] | Hacker Noon
, short for “list open files”. since everything, literally everything from network sockets to camera handles, is a file in unix-based systems (like macos). this means you can do things like
lsof | grep "AppleCamera"
in the terminal, to see if anyone’s using your camera (even if the little light is off)
or you can do
lsof -i -P -n | grep LISTEN
to see all programs with open network ports, if you want to say, kill a webserver that ran away on you, to open up the port. or if you’re locking down a machine. the thing’s a power tool