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# As we know, Drush 6 (the initial Drush installation on rouge-dev1, 2 and 3) only supports a maximum of Drupal 7.

# http://docs.drush.org/en/master/install (there is a table at the bottom of supported versions).

# You will need to run the following commands in order:

cd ~/.composer
vim composer.json

# This should list the Drush installation, and the version you are using. Press shift+a to edit this file, and swap the '6' in the version number for '8'. It is important that you set it as 8, not 9.

sudo composer global update

# This will download your package and overwrite the existing files in place.