<gunzip src="test.tar.gz"/>expands test.tar.gz to test.tar
<bunzip2 src="test.tar.bz2"/>expands test.tar.bz2 to test.tar
<gunzip src="test.tar.gz" dest="test2.tar"/>expands test.tar.gz to test2.tar
<gunzip src="test.tar.gz" dest="subdir"/>expands test.tar.gz to subdir/test.tar (assuming subdir is a directory).