_rename is a version of rename designed
to operate only on HFS files. _rename runs faster and calls
fewer other library routines than rename. Refer to
rename for a full description. _rename is used exactly
like the standard rename function. The arguments to
_rename are interpreted as HFS filenames, even if they appear
to begin with a style prefix or a leading // or both.
Copyright (c) 1998 SAS Institute Inc. Cary, NC, USA. All rights reserved.