Check for the program 'mysql'
let script continue if exists & works
pops up error message if not.
Testing of functionality is by invoking it with root password 'rootpass'
and a 'SELECT * FROM user' SQL statement.
That SQL statement will select all user information from the 'user' privileges table,
and should work on every proper MySQL server.
Besides checking mysql, this macro also set these environment variables upon completion:
MYSQL = which mysql