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+#print
+A very useful command is the command
+ diff x y
+which compares the two files x and y and tells
+you any differences between the files. If the files
+are the same, it says nothing. To test that,
+copy file "george" onto file "harry";
+then say
+ diff george harry
+to verify that the files are the same.
+#create george
+london bridge
+is falling down.
+#copyin
+#user
+#uncopyin
+#match diff george harry
+#match diff harry george
+#log
+#next
+12.3b 2