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#!/bin/sh
#
# Example script for duff(1).
#
# Copyright (c) 2005 Ross Newell
#
# Modified Jan 7, 2006 by Camilla Berglund <elmindreda@elmindreda.org>
#
# Uses duff to find duplicate physical files and changes them into hard links
# to a single physical file, thus saving disk space. Use with care.
#
if [ "$1" == '' ]; then
echo "usage: `basename $0` directory"
exit 1
fi
duff -r '-f#' -z -p -P "$1" |
(
while read file
do
if [ "$file" == '#' ]; then
first=''
else
if [ "$first" == '' ]; then
first="$file"
else
temp=`mktemp -p \`dirname $file\``
mv "$file" "$temp" && \
ln "$first" "$file" && \
touch --reference="$temp" "$file" && \
rm "$temp"
if [ $? != 0 ]; then
echo "`basename $0`: $file: failed to join with $first"
echo "`basename $0`: $file: may exist as $temp"
exit 1
fi
fi
fi
done
)
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