Use fdupe to hardlink duplicates

dedupe.sh

#! /usr/bin/env bash
#
# Use fdupe to hardlink duplicates
#
set -e #x

main() {
    echo "BEFORE: $(du -sh .)"
    fdupes --recurse --noempty --sameline . |while read -r dupes
    do  #echo "DUPES: $dupes"
        #xargs ls -ltr <<<"$dupes"

        xargs ls -tr1 <<<"$dupes" |while read -r dupe
        do  if [ -z "$first" ]
            then first="$dupe"

            elif [ -f "$first" -a -f "$dupe" ]
            then ln -f "$first" "$dupe"

            else
                >&2 echo "ERROR: cannot ln \"$first\" \"$dupe\""
                exit 1
            fi
        done
    done
    echo "AFTER: $(du -sh .)"
}

main
exit 0