/usr/share/texmf-texlive/makeindex/base/tex.ist is in texlive-base 2009-15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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%
% This file is part of
% MakeIndex - A formatter and format independent index processor
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% Author: Gabor Herr
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%
% $Log: tex.ist,v $
% Revision 1.1 1991/12/13 16:40:01 schrod
% Initial revision
%
% Revision 1.1 1991/08/26 17:48:31 herr
% Initial revision
%
%
% merge rules to handle TeX macros
% save printable macros
merge_rule "\\TeX" "TeX"
% handle mathematical formulas
include "math.ist"
% remove all other macros...
merge_rule "\\[A-Za-z]+[\t ]?" ""
% remove TeX grouping symbols
merge_rule "{" ""
merge_rule "}" ""
% white space is treated as one token
merge_rule "[ \t\n]+" " "
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