Question: How can I determine the linux version installed in a Linux OS

Answer: To determine your Mysql version, we will be using the mysql command with the -V (capitalize) option.

[darwin@myserver]$ mysql -V
mysql  Ver 14.7 Distrib 4.1.20, for pc-linux-gnu (i686) using  EditLine wrapper

Your mysql version here is 4.1.2.0.