Some versions of ed return with an error code if they encounter an EOF.
Thus:

diff -ur teTeX-1.0/texk/dvipsk/texc.script
teTeX-1.0-new/texk/dvipsk/texc.script
--- teTeX-1.0/texk/dvipsk/texc.script   Sun Nov  1 04:45:10 1998
+++ teTeX-1.0-new/texk/dvipsk/texc.script       Fri Sep 15 22:06:05 2000
@@ -9,4 +9,5 @@
 .,/% end code for uncompressed fonts only/d
 .,/% end of code for unpacking compressed fonts/s/% //
 w $2
+q
 edscriptend

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