how to build and deploy single war file using ant

hi,
we are using ant 1.6.1 version for building and deploying an application. application contains various modules. we have separate build.xml files for each module. i alreday deployed .ear file into the server. but i made changes in one of the modules. now i want to deploy this module only into the server instead of building whole project.
i am using Ecllipse for editing/compilation.
could u help me out in solving this problem by giving ,what are the steps to take after compilation in ecllipse.
with regards
vg reddy

Ant only rebuilds components that have changed ... or components that depend on components that have changed. So, it shouldn't be a problem for you.

hi ,
i m trying to update an ear file through ant. i guess u had the same task?
can u share with methe way u did it..