# B.37 ReflexiveTask The `ReflexiveTask` performs operations on files. It is essentially a convenient way to transform (using filter chains) files without copying them. Table B.37:聽Attributes NameTypeDescriptionDefaultRequired`file``String`A single file to be processed.n/aYes (unless <fileset> provided) B.37.1 Examples ``` <reflexive> <fileset dir="."> <include pattern="*.html"> </fileset> <filterchain> <replaceregexp> <regexp pattern="\r(\n)" replace="\1"/> </replaceregexp> </filterchain> </reflexive> ``` B.37.2 Supported Nested Tags: - `fileset` - `filterchain`