Good for scripting, like cron. Updates a rails app, then restarts it. (Note: probably good not to use this in production...)

Rails App Updater

set -e
set -v
git checkout .
git pull
bundle install
rake db:migrate:status | grep "^  down" || true
rake db:migrate
pgrep -c [r]uby && pkill -f ruby || true
rails s -d -p 80