/usr/share/texmf-texlive/makeindex/index/bibref.ist is in texlive-latex-recommended 2009-15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | preamble ""
postamble "\\endinput\n"
group_skip ""
headings_flag 0
heading_prefix ""
item_0 "\\biblabel{"
delim_0 "}{"
delim_n ", "
delim_r "--"
delim_t "}\n"
line_max 72
indent_space ""
indent_length 0
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