diffu.icn: Program to show differences in files

January 3, 1993; Rich Morin
This file is in the public domain.
This program exercises the dif() procedure, making it act like the
UNIX diff(1) file difference command.

Usage: diffu f1 f2

     3d2
     < c
     7,8c6,7
     < g
     < h
     ---
     > i
     > j

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