how to find all role in mysql

1Press CTRL+C to copy GRANT 'app_developer' TO 'dev1'@'localhost';
2GRANT 'app_read' TO 'read_user1'@'localhost', 'read_user2'@'localhost';
3GRANT 'app_read', 'app_write' TO 'rw_user1'@'localhost';

1Press CTRL+C to copy GRANT ALL ON app_db.* TO 'app_developer';
2GRANT SELECT ON app_db.* TO 'app_read';
3GRANT INSERT, UPDATE, DELETE ON app_db.* TO 'app_write';

1Copied CREATE USER 'dev1'@'localhost' IDENTIFIED BY 'dev1pass';
2CREATE USER 'read_user1'@'localhost' IDENTIFIED BY 'read_user1pass';
3CREATE USER 'read_user2'@'localhost' IDENTIFIED BY 'read_user2pass';
4CREATE USER 'rw_user1'@'localhost' IDENTIFIED BY 'rw_user1pass';