<delete file="/lib/ant.jar"/>deletes the file /lib/ant.jar.
<delete dir="lib"/>deletes the lib directory, including all files and subdirectories of lib.
<delete> <fileset dir="." includes="**/*.bak"/> </delete>deletes all files with the extension .bak from the current directory and any subdirectories.
<delete includeEmptyDirs="true"> <fileset dir="build"/> </delete>deletes all files and subdirectories of build, including build itself.