for ( <grm_backup-*_*_*_*_*_*_EST_*.bak>,
       <backup_db-*_*_*_*_*_*_EST_*.bak> )
{
    printf "File '%s' was last modified %d days ago\n", $_, -M;
}

##</code><code>##

while ($log_written == 0)
{
    ...
    $log_written = 1;
}