/usr/bin/checkdotdin is in din 5.2.1-5.
This file is owned by root:root, with mode 0o755.
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  | #! /bin/sh
datadir0=/usr/share/din/
datadir1=$HOME/\.din/
if test -d $datadir1
then
	echo "overwriting data files in: $datadir1"
else
	echo "creating: $datadir1"
	mkdir $datadir1
fi
for i in `ls $datadir0`
do
	cp -rfv $datadir0$i $datadir1$i
done
exit 0
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