This file is indexed.

/usr/bin/gri_unpage is in gri 2.12.23-8.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/usr/bin/perl
$usage = "
PURPOSE: Chop multipage Gri PostScript file into one file per page.
USAGE:   gri_unpage name.ps -- create files name-1.ps, name-2.ps, etc, one
                               for each page of name.ps.
         gri_unpage -h      -- print this help message
                    -l      -- set bounding box to letter page 612x792

BUGS:    1. Bounding box is always the same for all pages.
         2. Assumes that all Gri fonts are used even if they aren't.
";

eval { use Getopt::Std; ; };
my $use_getopts = $@ ? 0 : 1;

if ($use_getopts) {
    &getopts('hl');
    if ($opt_h) {
        print "$usage";
        exit 0;
    }
}

if ($#ARGV != 0) {
    die "Wrong number of arguments.\n$usage\n";
}

# Scan for BoundingBox to use that for each page.
if (! $use_getopts || ! $opt_l) {
    open(IN, $ARGV[0]) || die "Cannot open input file `$ARGV[0]'\n";
    while(<IN>) {
        if (/%%BoundingBox: [0-9 ]+/) {
            $boundingBox = $_;
            chop($boundingBox);
            last;
        }
    }
    close(IN);
}
if (! defined($boundingBox)) {
    $boundingBox = "%%BoundingBox: 0 0 612 792";
}

$file = $ARGV[0];
$file =~ s/\.ps$//;

open(IN, $ARGV[0]) || die "Cannot open input file `$ARGV[0]'\n";
$prologue = "";
while(<IN>) {
    $prologue .= $_;
    last if (/%%EndProlog/);
}
$epilog = "
%%Trailer
$boundingBox
%%DocumentFonts: Courier Helvetica Palatino-Roman Palatino-Italic Symbol Times-Roman
%%Pages: 1
";

$page = 0;

while(<IN>) {
    if (/%%Page:/) {
	$page++;
	if ($page < 10) {
	    $name = sprintf("$file-0%d.ps", $page);
	} else {
	    $name = sprintf("$file-%d.ps", $page);
	}
	if ($page != 1) {
	    print OUT $epilog;
	    close(OUT);
	}
	print STDERR "Creating file $name\n";
	open(OUT, ">$name") || die "Cannot open output file `$name'\n";
	print OUT $prologue;
    } else {
	print OUT;
    }
}
close OUT if ($page != 0);