One possible solution to the sort problem:

* Continue to accept the old syntax for now,
   but add a warning message, something like:
   "Warning: sort +N is deprecated, use -k instead."

* After a year, drop support for the
   old syntax.  After staring at warning
   messages for a year, few people will
   be able to claim ignorance.

The messages will serve both to advertise
the change and to flag those scripts that
rely on the old syntax.


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