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eda-tools/sch2fig/test/comp

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#!/bin/sh
diffs=0
rm -f _diff*png
for n in out*.png; do
ref=ref${n#out}
diff=_diff${n#out}
if ! compare -metric AE $ref $n - >/dev/null; then
diffs=`expr $diffs + 1`
compare -metric AE $ref $n $diff
fi
done
echo
[ $diffs = 0 ] && exit 0
echo "$diffs difference(s)" 1>&2
exit 1