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#/bin/bash
cat $1 | \
sed -E 's/ /: /' | \
cut -c 1-59 | \
sed -E 's/ (..) (..)/ \1\2/g' | \
sed 's/ / /g' | \
grep ': ' | \
xxd -r > $2
# real hexdump -C has a trailing file size, but it isn't always
# present
hexsize=$(tail -1 $1)
if [ ${#hexsize} = 8 ]; then
decsize=$(printf '%d' $hexsize)
echo "truncate up to $decsize"
truncate --size $decsize $2
fi
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