Removing older versions on Google App Engine

Google App Engine holds onto older versions of your app after you push a new deployment, however there are limits (20) to how many you can keep. If you hit this limit any new pushes will fail to deploy. I wanted my Continuous Deployment pipeline to keep the last 3 versions of a service. The following bash script will do this for me:

*#!/bin/bash*

VERSIONS**=**$(gcloud app versions list --service $1 --sort-by '~version' --format 'value(version.id)')
COUNT**=**0
echo "Keeping the $2 latest versions of the $1 service"
**for** VERSION **in** $VERSIONS
**do((**COUNT++**))if** **[** $COUNT -gt $2 **]then**
      echo "Going to delete version $VERSION of the $1 service."
      gcloud app versions delete $VERSION --service $1 -q
    **else**
      echo "Going to keep version $VERSION of the $1 service."
    **fi
done**

You can call it like this:

bash delete-older-gcloud-app-versions.sh default 3

The first argument is the service name and the the next argument is the number of versions to keep.