Command Line Usage
Before version 1.7 of tortoiseSVN, the command line tool will be integrated with installation of tortoisesvn.
So just set the C:\Program Files\TortoiseSVN\bin into path environment variable.
But on the installer (of version 1.7 and later) you can select the "command line client tools" option so you can call svn commands (like svn commit and svn update) from the command line.
Here's a screenshot of the "command line client tools" option in the installer, you need to make sure you select it:
