I haven't updated drush in awhile and looking to update it to the latest. I'm not exactly sure how it was installed originally. But when I do a which drush, it shows it resides in /usr/bin/drush
When I do a drush dl drush - I only get the option to upgrade to 7.x only.
How can I update it to Drush 9?
Can I just do a git clone of the drush repo from: https://github.com/drush-ops/drush
Then do I just do a checkout of the drush 9 tag? But how do I make it the default drush application to run? Or do I just overwrite the file in /usr/bin/drush?
FYI: My linux server admin skills aren't up to par.