Make timelapses from multiple monitors on OSX

osx_multi_screenshot.sh

#!/bin/bash

if [ "x$1" == "x" ]
    then
    TIME=5
else
    TIME=$1
fi

while [ true ]
    do
    echo "`date` capturing screenshot..."
    ## Change Screen 1 size
    screencapture -x -tjpg -R0,0,1920,1080 mbpro_1_screenshot_`date +%s`.jpg
    ## Change Screen 2 size, be careful with the geometry!
    screencapture -x -tjpg -R0,1080,1280,800 mbpro_2_screenshot_`date +%s`.jpg
    echo "Sleeping $TIME seconds"
    sleep $TIME
done