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-rw-r--r--contrib/plan9/hgrc.d/9diff.rc7
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diff --git a/contrib/plan9/hgrc.d/9diff.rc b/contrib/plan9/hgrc.d/9diff.rc
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+# The 9diff extdiff command generates diff(1) compatible output
+# suitable for use with the plumber(4).
+[extensions]
+extdiff =
+
+[extdiff]
+9diff = 9diff -cm $parent $child $root