This file is indexed.

/usr/bin/grace-thumbnailer is in grace 1:5.1.25-5build1.

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

The actual contents of the file can be viewed below.

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#!/bin/sh

size=128x96

if [ $1 = "-s" ]; then
	shift
	size=$1
	shift
fi

infile="$1"
outfile="$2"

tmppng=$(mktemp /tmp/grace-thumbnail-XXXXXX)

gracebat -hdevice PNG -printfile $tmppng "$infile"
convert -resize $size -sharpen 4 $tmppng "$outfile"
rm -f $tmppng