<filter token="year" value="2000"/> <copy todir="${dest.dir}" filtering="true"> <fileset dir="${src.dir}"/> </copy>will copy recursively all the files from the src.dir directory into the dest.dir directory replacing all the occurrences of the string @year@ with 2000.
<filter filtersfile="deploy_env.properties"/>will read all property entries from the deploy_env.properties file and set these as filters.