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qsort

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• name:
  qsort
• synopsis:

  qsort inputfile outputfile [-descending_order] [-unique] [-x_tolerance= value] [-y_tolerance= value] [-format=" format-string"]

• description:
  Uses the quick-sort algorithm to sorts a data set into ascending (or descending) order by the abscissae, subsorting by the ordinates, with optional elimination of duplicate points.
• files:
  inputfile contains the data set to be sorted. The result is placed in outputfile.
• options:

  descending_order

  
  Requests sorting into descending order, rather than the default ascending order.

  unique

  
  Requests elimination of duplicate points.

  x_tolerance, y_tolerance

  
  These options specify tolerances for the abscissae and ordinate values. Any two values within the relevant tolerance of one another are considered identical. If both the abscissae and ordinates of two points are identical in this sense, the points are considered duplicates. The default value is 0 for both tolerances.

  format

  
  Specifies a C-style format string for printing the data to the output file.