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Global symbol "$file" requires explicit package name at ./backup.pl li +ne 9.
# before your loop $sth_achroms = $dbh -> prepare( " ... $sth_achroms -> execute( $achrom[0],$achrom[1],$achrom[2], $achrom[3], $achrom[4], $achrom[5], $achrom[6], $achrom[7], $achrom[8]);