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     Macro modifiers specify parts of the predefined filename macros.
     You can append one of the modifiers to any of the filename macros
     to extract part of a filename. If you add one of these modifiers
     to the macro, enclose the name and modifier in parentheses.
 
     NOTE:  In a commands block, there is another way to represent
            components of the first dependent filename.
            See: ◄Filename-Parts Syntax►
 
          Modifier    Resulting Filename Part
 
          D           Drive plus directory
 
          B           Base name
 
          F           Base name plus extension
 
          R           Drive plus directory plus base name
 
     If $@ represents the target C:\SOURCE\PROG\SORT.OBJ, the effect of
     combining each modifier with $@ is as follows::
 
          Invoked Macro    Value
 
          $(@D)            C:\SOURCE\PROG
 
          $(@F)            SORT.OBJ
 
          $(@B)            SORT
 
          $(@R)            C:\SOURCE\PROG\SORT
 
     If $@ represents the target SORT.OBJ without a path, the value of
     the modified macro $(@R) is SORT, and the value of $(@D) is a
     period (.) to represent the current directory.
 
     Example
 
          # Files in the c:\objects directory depend on
          # the versions in the current directory.
          DIR = c:\objects
          $(DIR)\a.obj $(DIR)\b.obj $(DIR)\c.obj : $$(@F)
            COPY $(@F) $@
 
     This example uses the F modifier to specify a file of the same
     name in the current directory.
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