/usr/share/texlive/texmf-dist/web2c/empty.tcx is in texlive-base 2013.20140215-1ubuntu0.1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 | %% empty.tcx
%% $Id: //depot/Master/texmf/web2c/empty.tcx#1 $
%% Originally written 2005, Karl Berry.
%% This file is released into the public domain.
%%
%% This tcx maps nothing at all. This is useful to get back to the
%% compiled-in behavior when the formats were dumped with
%% --translate-file, which is the case for everything but (plain) "tex"
%% in TeX Live. Thus,
%% latex foobar -> terminal etc. output with 8-bit chars
%% latex --translate-file=empty.tcx -> terminal etc. output with ^^ notation
%%
%% http://tug.org/texinfohtml/web2c.html#TCX-files has more.
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