This file is indexed.

/usr/share/a2ps/sheets/sheets.map is in a2ps 1:4.14-1.3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# sheets.map - Guessing the type of a file             -*- Makefile -*-
# This file is part of a2ps.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; see the file COPYING.  If not, write to
# the Free Software Foundation, 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
#

# Style Sheet Files
# =================
#
#    The style sheets are defined in various files.  See *note Pretty
# Printing:: for the structure of these files.  As for most other
# features, there is main file, a road map, which defines in which
# condition a style sheet should be used (*note Map Files::).  This file
# is `sheets.map'.
#
#    Its format is simple:
#      STYLE-KEY: PATTERNS
#    or
#      include(FILE)
#
#    The PATTERNS need not be on separate lines.  There are two kinds of
# patterns:
#
# /PATTERN/FLAGS
#      if the current file name matches PATTERN, then select style
#      STYLE-KEY (i.e. file `STYLE-KEY.ssh').
#
# <PATTERN>FLAGS
#      if the result of a call to `file(1)' matches PATTERN, then select
#      style STYLE-KEY.
#
#    Currently FLAGS can only be `i', standing for an insentive match.
# Please note that the matching is not truly case insensitive: rather, a
# lower case version of the string is compared to the PATTERN as is,
# i.e., the PATTERN should itself be lower case.
#    The special STYLE-KEY `binary' tells a2ps to consider that the file
# should not be printed, and will be ignored, unless option
# `--print-anyway' is given.
#
#    If a style name can't be found, the plain style is used.
#
#    The map file is read bottom up, so that the "last" match is honored.
#
#    Two things are to retain from this:
#
#   1. if the file is presented through `stdin', then a2ps will run
#      `file(1)'.  However, unless you specify a fake file name with
#      `--stdin', pattern matching upon the name is turn off.  In general
#      you can expect correct delegations, but almost never pretty
#      printing.
#
#   2. if `file' is wrong on some files, a2ps may use bad style sheets.
#      In this case, do try option `--guess', compare it with the output
#      of `file', and if the culprit is `file', go and complain to your
#      system administrator :-), or fix it by defining your own filename
#      pattern matching rules.
#
#    Consider the case of Texinfo files as an example (the language in
# which this documentation is written).  Files are usually named
# `foo.texi', `bar.txi', or even `baz.texinfo'.  `file(1)' is able to
# recognize Texinfo files:
#
#      doc % file a2ps.texi
#      a2ps.texi: Texinfo source text
#
#    Therefore the sheets.map would look like:
#
#      # Texinfo files
#      texinfo:  /*.txi/  /*.texi/  /*.texinfo/
# 		 <Texinfo source*>


# Default language
plain:	/*/

# Some binary files we probably don't want to print
binary:	/*.tar.*/
	/*.tar/
	/*.tgz/
	/*.[ao]/
	<ELF*>
	<data>
	<PA-RISC*>

# Backup files
binary:	/*~/
	/*.bak/
	/*.bk[0-9]/

# SCCS files
# FIXME: SCCS is dead, and I'm not sure what this rule meant anyway.
# Also, the adverse effect is really bad...so I simply commented this out now.
#binary:	/[sp].*/
#	/*\/[sp].*/

# Troff, Nroff, and Groff files
# We put them at the top, because it is common to see file(1) say a file
# is a roff file.  So let's first give a chance to the other rules.  Also,
# compressed files should be check first so that /usr/man/man1/a2ps.1.gz
# is correctly recognized as compressed.
roff:	/man\/man*\/*/
	/*\/man\/man*\/*/
	<troff*>

# Compressed files
gzip:	/*.gz/
	<gzip compressed*>
bzip:	/*.bz/
	<bzip compressed*>
bzip2:	/*.bz2/
	<bzip2 compressed*>
compress:	/*.Z/
		<compress*>

# a2ps configuration files
a2psrc:	/a2ps*.cfg/
	/*\/a2ps*.cfg/
	/.a2psrc/
	/*\/.a2psrc/
	/a2psrc/
	/*\/a2psrc/

# Makefile's
make:	/*.mk/
	/[Mm]akefile/	/*\/[Mm]akefile/
	/[Mm]akefile.*/	/*\/[Mm]akefile.*/

# GNUMakefiles
gmake:	/GNUmakefile/	/*\/GNUmakefile/

# Don't let file try to guess something else than `plain'
# (Some file(1) can easily reply `data' on such files).
plain:	/*.doc/
	/*.txt/

# Ada files
ada:	/*.ad[abs]/

# ASN.1 files
asn1:	/*.asn1/

# Autoconf files
autoconf: /configure.in/ /*\/configure.in/
	/ac*.m4/  /*\/ac*.m4/

# AWK scripts
awk:	<*awk*>
	/*.awk/
	/*.nawk/

# B files
b:	/*.mch/

# BC files
bc:	/*.b/

# C files
c:	/*.[chi]/
	/*._c/
	/*.h.in/

# C++ files
# Some people use C and H, but it is much more useful not to consider
# the case, so we just can't here.
cxx:	/*.cc/
	/*.hh/
	/*.[ch]++/
	/*.[ch]pp/
	/*.[ch]xx/
	/*.pdb/

# C# files
csharp:	/*.cs/

# SpecC
specc:	/*.sc/
	/*.sh/

# OCaml files
ocaml:	/*.ml/
	/*.ml[il]/

# ChangeLog files
chlog:	/ChangeLog*/	/*\/ChangeLog*/

# CORBA IDL
cidl:	/*.idl/

# claire files
claire:	/*.cl/

# common-lisp files
clisp:	/*.l/
	/*.lisp/
	/*.lsp/
	/*.clisp/


# Small files
small: /*.sma/

# coq-vernacular files
coqv:	/*.coq/

# DVI files
# a2ps is not supposed to print them, but it proves useful
# to define them for the delegations
dvi:	/*.dvi/i
	<TeX DVI file>

# eiffel files
eiffel:	/*.e/

# Emacs lisp files
elisp:	/*.el/

# Encapsulated PostScript files
eps:	/*.eps/i
	/*.eps[fi]/i
	/*.pstex/i

# Fortran files
# By default a2ps chooses the style sheet `fortran' which tries to
# support both fixed and free forms of comments.  Nevertheless, this
# cannot match all your needs, so you may want to specify other rules
# that map to
# - for77-fixed, Fortran 77 Fixed form
# - for77-free, Fortran 77 Free form
# - for90-fixed, Fortran 90/95 Fixed form
# - for90-free, Fortran 90/95 Free form
fortran:
	/*.f9[50]/i
	/*.f77/i
	/*.f/i
	/*.for/i

# GIF Images
gif:	/*.gif/i
	<GIF image*>

# Haskell programs
haskell:
	/*.hs/
	<*/runhugs>

# HTML documents
html:	<HTML*>
	/*.html/i
	/*.htm/i
	/*.cgi/

# initora files
initora:	/init.ora/
	/*\/init.ora/

# Java files
java:	/*.java/

# JavaScripts
js:	/*.js/

# JPEG images
jpeg:	/*.jpg/i  /*.jpeg/i
	<JPEG*>

# Lace files
lace:	/*.ace/
	/Ace.*/	/*\/Ace.*/

# (F)Lex files
lex:	/*.l/
	/*.lex/

# 68000 files
68000:	/*.68000/
	/*.[sS]/

# NASM files
nasm:	/*.asm/

# mailfolder files
mail:	/*.news/  /*.mail/
	<mail *> <news *> <RFC 822 mail text> <Emacs RMAIL text>
        # Tmp files from elm.
	/\/tmp\/snd.*/ 	/\/tmp\/print.*/

# ASN.1 mib files
mib:	/*.mib/

# OCaml Yacc
mly:	/*.mly/

# modula-2 files (mocka and default extensions)
modula2:
	/*.m[di]/
	/*.def/
	/*.mod/

# modula-3 files
modula3:
	/*.[im]3/

# Matlab file
matlab:	/*.m/

# o2c files
o2c:	/*.o2/
	/*.o2c/

# oberon files
oberon:	/*.oberon/

# octave files
octave:	/*.octavescript/

# oracle files
oracle:	/*.ora/

# Pascal files
pascal:	/*.pas/
	/*.p/

# PDF documents
pdf:	/*.pdf/i
	<PDF document*>

# Perl files
perl:	/*.p[ml]/
	<*perl*>

# PHP files
php:	/*.php/

# plsql files
plsql:	/*.pk[sb]/
	/*.pls/

# PNG files
png:	/*.png/i
	<PNG image*>

# Portable Object (Gettext)
po:	/*.po/

# Pov-Ray
pov:	/*.pov/

# PostScript Printer Description files
ppd:	/*.ppd/i

# PostScript files
ps:	/*.ps/i
	/*.prn/i
	<[pP]ost[Ss]cript*>

# PreScript files
pre:	/*.prescript/
	/*.biftex/
	/*.bif/
	/*.pre/
	/*.ptf/

# prolog files
prolog:	/*.plg/
	/*.pro/

# Promela files
promela:
	/*.pml/

# python files
python:	<*/python>
	<*python script*>
	/*.py/

# GNU R files, as well as S language files
s:     /*.[RSrsq]/

# GNU R documentation files
rd:    /*.[Rr]d/

# Ruby files
ruby:	/*.rb/

# GNU R (and S language) transscript files
st:    /*.St/
        /*.Rout/

# REXX command files
rexx:	/*.cmd/i

# sather files
sather:	/*.sa/

# scheme files
scheme:	/*.scm/

# SDL-88 files
sdl88:	/*.pr/
	/*.sdl/

# Sed scripts
# Be very careful not to introduce <*sed*>, which would match `compressed'
# too!
sed:	/*.sed/
	<*/sed*>

# a2ps' style sheet files
ssh:	/*.ssh/

# sh files
sh:	<*/sh*>
	<*[Ss]hell*>

# Ash files
sh:	<Neil Brown*>

# Bash files
sh:	<Bourne-Again*>
	<*bash*>

# Csh files
csh:	/.csh*/
	/*\/.csh*/
	<C [Ss]hell*>
	<c-shell*>
	<*csh*>

# Ksh
sh:	<Korn *>
	<*ksh*>

# Tcsh
tcsh:	/.tcsh*/
	/*\/.tcsh*/
	<Tenex C shell*>
	<*tcsh*>

# Zsh files
zsh:	<*zsh*>
	<Paul Falstad*>
	/.zsh*/
	/*\/.zsh*/

# Standard ML
sml:	/*.sml/
	/*.sig/
	/*.fun/

# sql files
sql:	/*.sql/

# sql92 files
sql92:	/*.sql92/

# Synopsis scripts
synopsis:
	/*.scr/
	/*.wscr/
	/*.con/
	/.synopsys_dc.setup/
	/*\/.synopsys_dc.setup/

# (La)TeX files
tex:	/*.[dl]tx/
	/*.cl[os]/
	/*.sty/
	/*.tex/
	/*.pstex_t/
	<TeX document *>
	<LaTeX *>

# Texinfo files
texinfo:	/*.txi/		/*.texi/	/*.texinfo/
	<Texinfo source*>

# tcl files
tcl:	/*.tcl/
	/*.tclscript/

# Extended Tcl
tclx:	/*.tclx/
	<*tclx*>

# Visual Tcl
vtcl:	/*.vtcl/
	<*vtcl*>

# TIFF images
tiff:	/.tif/i  /.tiff/i
	<TIFF image*>

# tk files
tk:	/*.tk/
	/*.wish/

# Tiger
tiger:	/*.tig/

# Unity files
unity:	/*.unity/

# VERILOG files
verilog:	/*.v/	/*.vh/

# VHDL files
vhdl:	/*.vhdl/i
	/*.vhd/i

# VRML files
vrml:	/*.wrl/

# XBM images
xbm:	/*.xbm/i

# XPM images
xpm:	/*.xpm/i

# Perl XS files
xs:	/*.xs/

# Yacc/Bison grammars
yacc:	/*.y/
	/*.yacc/

# Stratego files
stratego:	/*.r/