psa-2018-003.sh

#!/bin/bash

while read site; do
    echo -e "Started updating ${site}"
    terminus upstream:cc $site
    terminus upstream:updates:apply --accept-upstream $site.dev
    terminus env:deploy --sync-content --note="Patching PSA-2018-003" --cc -- $site.test
    terminus env:deploy --note="Patching PSA-2018-003" --cc -- $site.live
    echo -e "Finished updating ${site}\n\n\n"
done <sites.txt

sites.txt

drupal-site
my-drupal-site
another-drupal-site

1. Put your own Drupal site(s) in the sites.txt file.
2. Give the psa-2018-003.sh script execute permissions (chmod u+x psa-2018-003.sh)
3. Run the script: ./psa-2018-003.sh