To download and install the Force.com Migration Tool:
Log into a Salesforce organization
on your deployment machine.
From Setup, click Develop | Tools, and then click Force.com Migration Tool.
Save the .zip file locally and extract the
contents to the directory of your choice.
Copy ant-salesforce.jar and paste into your
Ant installation's lib directory. The lib directory is located in the root folder of your Ant
installation.
When you extract the Force.com Migration Tool zip
files, the following folders and files are written to the location
you specified:
A Readme.html file that explains how to use
the tools
A Jar file containing the ant task: ant-salesforce.jar
A sample folder containing:
A codepkg\classes folder that contains SampleDeployClass.cls and SampleFailingTestClass.cls
A codepkg\triggers folder that contains SampleAccountTrigger.trigger
A mypkg\objects folder that contains the
custom objects used in the examples
A removecodepkg folder that contains XML
files for removing the examples from your organization
A sample build.properties file that you must
edit, specifying your credentials, in order to run the sample ant
tasks in build.xml
A sample build.xml file, that exercises the deploy and retrieveAPI calls