As a brief note to self, if you forget the MySQL root password again, these are the steps you followed to create a new MySQL root password on an existing MySQL server running on Ubuntu 16.x:
MySQL login FAQ: How do I log into a MySQL database?
Assuming you have the root password, this MySQL command from your Unix/Linux command line will work:
mysql -u root -p
After issuing that MySQL login command you will be prompted for the root user password. Just enter that root password, and you should be in. After you login, your console should look like this (using MySQL version 5):
Assuming you are the root user on a Linux computer, here's a quick example of how to run a program with a Linux crontab entry as another user. Specifically in this example, the program being executed is run as the user