#! /bin/bash
    
    cmp_timestamp=$(date --date="60 days ago" +%Y%m%d)
    
    while read filename; do
            [[ $filename =~ _(20[0-9][0-9][01][0-9][0123][0-9])\. ]]
            timestamp=${BASH_REMATCH[1]}
            printf "%-40s : %s\n" "$filename" "${timestamp}" 
            if [ "$timestamp" -lt "$cmp_timestamp" ]; then
                    echo "   delete this file"
                    : rm "$filename"
            else
                    echo "   DO NOT delete this file"
            fi
            echo
    done <file