Change the color of the iterm tab based on the return value of the last command. RSpec in this case. Good for writing code with fasts tests when you don't want to pay attention to the test window. I Usually use this with a file system watching tool like watchexec. `watchexec --exts js,rb ./bin/spec_runner`

spec runner

#! /usr/local/bin/zsh

# bin/spec_runner

function color {
  case $1 in
    green)
      echo -e "\033]6;1;bg;red;brightness;57\a"
      echo -e "\033]6;1;bg;green;brightness;197\a"
      echo -e "\033]6;1;bg;blue;brightness;77\a"
      ;;
    red)
      echo -e "\033]6;1;bg;red;brightness;270\a"
      echo -e "\033]6;1;bg;green;brightness;60\a"
      echo -e "\033]6;1;bg;blue;brightness;83\a"
      ;;
    orange)
      echo -e "\033]6;1;bg;red;brightness;227\a"
      echo -e "\033]6;1;bg;green;brightness;143\a"
      echo -e "\033]6;1;bg;blue;brightness;10\a"
      ;;
  esac
}

rspec spec/

if [ $? -eq 0 ]
then
  color green
else
  color red
fi