Learn Perl. Learn to use CPAN. You can roll your own codes, but most likely there's someone else that has done it already.
use strict;
use warnings;
use IO::File;
use DNS::ZoneParse;
my @zonefiles = </path/to/zonefile/*>;
foreach my $zonefile (@zonefiles) {
my $z = DNS::ZoneParse->new($zonefile);
# change ttl in all MX records, for example
my $mx = $z->mx;
$_->{ttl} = 'foo bar' for (@$mx); # update ttl
$z->new_serial();
# write the new zone file to disk
my $zf = new IO::File "$zonefile", "w"
or die "Error writing zonefile: $!";
print $zf $z->output();
}
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