How to Use ANT in salesforce

Hi friends here We will learn How to deal with deployment process using ANT. If you have ANT then fine
other wise download apache-ant-1.8.2 or higher version and go through these steps for installing ANT.
Step 1 Download apache-ant-1.8.2-bin from Web.
step 2 install jdk1.6.0_25 or higher version.
Step 3 go to run command use command sysdm.cpl press "advanced" tab then press "environment variable" tab then press on
tab "New"

create two variable ANT_HOME and JAVA_HOME
ANT_HOME D:\apache-ant-1.8.2-bin\apache-ant-1.8.2 (if your ant folder is in D- drive)                    
JAVA_HOME  C:\Program Files\Java\jdk1.6.0_25 (give path of jdk)

PATH %SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\ProgramFiles\Java\jdk1.6.0_25\jre\bin;D:\apache-ant-1.8.2-bin\apache-ant-1.8.2\bin;
(if path variable is alreadyavailable then append this also other wise create new Path variable)

for more detail go to
http://ant.apache.org/manual/index.html

Now we move to "How to Use ANT for deployment in Apex"

for this Process
1) First of all create package.xml(depends requirement )
2) And Use build.xml and
3) build.property (change credential according to your requirement)