A. You should be searching the MySQL documentation and forums
B. and I suspect I knew what CLS meant b4 ippo was born (quite possibly) http://en.wikipedia.org/wiki/CP/M
C. Buy a book (not a 'textbook' -- as they are usually written by academics who theorize but do little else) or get a tutuorial video on MySQL (yes they both still exist and are quite inexpensive). I have many dozens (maybe over a hundred) of books and training videos on databases and programming languages, and I use them to solve these exact kind of issues (lack of knowledge). If you REALLY want to learn MySQL using the mySQL monitor (that's the right name for the 'mysql prompt') use the Linux CBT MySQL course.http://www.linuxcbt.com/products_linuxc ... dition.php
just look at the syllabus there!
I purchased the series before it was a subscription service (was very expensive) BUT well worth every penny. Now you can get a month (and likely most of the material done for $99.00) The presenter does almost all of the examples using the MySQL monitor. (that's why I know a fair amount about it)