As Amarok is not even importing duplicate files into it's database, it can't help you.

However you can use the before mentioned amarok_collectionscanner.
If you run it over the whole collection you will get a nice XML summary of all the tracks. You can write a small script looking for duplicate IDs and then reporting the smaller of those files.

I was dreaming of a "clean-up assistant" that would help you do a clean up of the collection, but that's just a dream right now.

Thank you Man

I removed all duplicated tracks using this command:

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find ~/Music  -iname '*(*).mp3' -exec cleanup-assistant1.sh '{}' \;

and this script named "cleanup-assistant1.sh" :

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    t=`echo "$1" | sed -e 's/ (1)//'`
    if (( `stat -c '%s' "$1"` < `stat -c '%s' "$t"` )); then
            rm "$1";
    else
            rm "$t";
    fi


Plus this command:

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find ~/Music -iname '*.mp3' -exec ~/cleanup-assistant2.sh '{}' \;

with this script named "cleanup-assistant2.sh" :

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    t=`echo $1 | sed -e 's/\.mp3/\.flac/'`
    if [ ! -e "$t" ]; then
            exit
    fi
    if (( `stat -c '%s' "$1"` < `stat -c '%s' "$t"` )); then
            rm "$1";
    else
            rm "$t";
    fi


and i have nothing duplicated, but when i reconfigured Amarok shows lot's of errors like this:

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Track ~/35 The Ballad Of Ira Hayes.mp3 with uid amarok-sqltrackuid://mb-xxx already committed. There seems to be a duplicate uid.

i checked this file and it was not on the same Album:


then i used amarok_afttagger to recreate uid for files with this files:

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amarok_afttagger -r -d -n ~/Music

and reconfigured Amarok, but nothing changed and the same problem.
any other idea?