NAME:
  mkdir
 PURPOSE:
  Create a new directory
 DESCRIPTION:

 CATEGORY:
  File I/O
 CALLING SEQUENCE:
  mkdir,dir
 INPUTS:
  dir - String containing name of directory to create.
 OPTIONAL INPUT PARAMETERS:

 KEYWORD INPUT PARAMETERS:

 OUTPUTS:

 KEYWORD OUTPUT PARAMETERS:

 COMMON BLOCKS:

 SIDE EFFECTS:

 RESTRICTIONS:
  MacOS:
     Unable to create a directory at the top level of a disk partition
     unless it is currently set as the working directory.  For example:
     if your disk is named "Internal HD", the command
        macmkdir,"Internal HD:newdirectory"
     will not work unless your current working directory is "Internal HD"

 PROCEDURE:

 MODIFICATION HISTORY:
  1999 Nov 14, Written by Marc W. Buie, Lowell Observatory with help from
      Dave Osip, MIT on the Mac related code.