A quick and dirty shell script to turn on the Lightpack, launch Plex, then turn off the Lightpack when Plex exits.

launch_plex.sh

#!/bin/bash

# A quick and dirty shell script to turn on the Lightpack, launch Plex, then   
# turn off the Lightpack when Plex exits.

# Turn on Lightpack
(sleep 1; echo "lock"; echo "setstatus:on"; sleep 1; echo "exit") \
  | telnet 127.0.0.1 3636;

# Launch Plex Home Theater, and turn off Lightpack on exit
"/Applications/Plex Home Theater.app/Contents/MacOS/Plex Home Theater" \
  && (sleep 1; echo "lock"; echo "setstatus:off"; sleep 1; echo "exit") \
    | telnet 127.0.0.1 3636