Henryk

NOW=`date +%s`cd $1 || exit 1mode=daycurrent_slot=0slot_filled=0for name in `ls -1d ????-??-?? | sort -n -r`; do    timestamp=`date -d "${name}" +%s`    age=$((${NOW}-${timestamp}))    case ${mode} in        day)            echo "Keep ${name}"            if [ ${age} -ge $((7*24*3600)) ]; then                echo "  Go to week mode"                mode=week                current_slot=`date -d "${name}" +%V`                slot_filled=1            fi            ;;        week)            weeknum=`date -d "${name}" +%V`            if [ "${slot_filled}" -eq "1" -a "${weeknum}" -eq "${current_slot}" ]; then                echo "Delete ${name}"                mv -i "${name}" old/            else                echo "Keep ${name}"                if [ "${age}" -ge $((28*24*3600)) ]; then                    echo "  Go to month mode"                    mode=month                    current_slot=`date -d "${name}" +%m`                    slot_filled=1                else                    current_slot=${weeknum}                    slot_filled=1                fi            fi            ;;        month)            monthnum=`date -d "${name}" +%m`            if [ "${slot_filled}" -eq "1" -a "${monthnum}" -eq "${current_slot}" ]; then                echo "Delete ${name}"                mv -i "${name}" old/            else                echo "Keep ${name}"                current_slot=${monthnum}                slot_filled=1            fi            ;;    esacdone