Semantics : FSFileModStatements

FSFileModStatements  ::=  ( remove | setFileTime | setReadOnly | chgrp | chmod | chown ) ( Expr )?
( except Expr | in Expr | to Expr | recursive | noHidden | fileOnly | dirOnly )*

Used by:  

For the selected files, perform these operations.

Note that chgrp , chmod and chown runs a operating system command to achieve the tasks, so are only available on systems that supports them.