Name
achfile — change type and/or creator of Apple Macintosh files (netatalk
    format)
Synopsis
achfile  [ -t    type ] [ -c    creator ]  file... 
DESCRIPTION
achfile changes the Macintosh type and/or creator
    of the file arguments which have a
    corresponding .AppleDouble file.
OPTIONS
-t type change the type.
-c creator change the
    creator.
DIAGNOSTICS
returns exit status 0 if all files changed successfully