How to update all your Heroku apps to cedar-14

update-to-cedar-14.sh

# The Cedar-14 stack is the latest version of the Heroku Cedar stack. 
# It features updated system dependencies and runs on a recent version of Ubuntu Linux.

# Use this scipt to update all your apps.

# Fill this array with your apps' names.
apps=( app-name-1 app-name-2 app-name-3 app-name-4 ... app-name-n )

for app in "${apps[@]}"
do
  heroku git:clone -a ${app}; cd ${app}; heroku stack:set cedar-14; git commit --allow-empty -m "Upgrade to Cedar-14"; git push heroku master; cd ..
done