ls ${CARTELLA_BACKUPS} | grep -v -e "$(echo -n "$(ListaBackupsUnica)" | sed "s//\\\|/g")"

BackupsDaCancellare | while read file_da_cancellare; do
rm -rf ${file_da_cancellare}

#!/bin/bash
CARTELLA_BACKUPS=/mnt/BACKUP/
function ListaBackupsAnnui() {
for i in 0 1 2 3 4 5
do ls ${CARTELLA_BACKUPS} | egrep "$[0-9]{2}.[0-9]{2}.(date +%Y -d "${i} year ago")" | sort -u | head -n 1
done
}

function ListaBackupsMensili() {
for i in 0 1 2 3 4 5 6 7 8 9 10 11 12
do ls ${CARTELLA_BACKUPS} | egrep "$[0-9]{2}.(date +%m -d "${i} month ago".%Y)" | sort -u | head -n 1
done
}

function ListaBackupsSettimanali() {
for i in 0 1 2 3 4
do ls ${CARTELLA_BACKUPS} | grep "$(date +%d -d "last monday -${i} weeks".%m.%Y)"
done
}

function ListaBackupsGiornalieri() {
for i in 0 1 2 3 4 5 6
do ls ${CARTELLA_BACKUPS} | grep "$(date +%d -d "-${i} day".%m.%Y)"
done
}

function ElencoComplessivo() {
ListaBackupsAnnui
ListaBackupsMensili
ListaBackupsSettimanali
ListaBackupGiornalieri
}

function ListaBackupsUnica() {
ElencoComplessivo | sort -u
}

function BackupsDaCancellare() {
ls ${CARTELLA_BACKUPS} | grep -v -e "$(echo -n "$(ListaBackupsUnica)" | sed "s//\\\|/g")"
}

cd ${CARTELLA_BACKUPS}
BackupsDaCancellare | while read file_da_cancellare; do
rm -rf ${file_da_cancellare}
done