Something like this:
use strict;
use warnings;
my %data;
<DATA>;
while(<DATA>){
chomp;
next if/^\s*$/;
my ($key, $value) = split;
push @{$data{$key}},$value;
}
my $counter;
for(keys %data){
for(@{$data{$_}}){
++$counter if $_ == 1 or $_ == 3;
}
print $_,' a good file',$/ if $counter == 2;
}
__DATA__
field1 field2
3-2000/7.48 1
3-2000/7.48 2
3-2000/7.48 2
3-2000/7.48 2
3-2000/7.48 2
3-2000/7.48 2
3-2000/7.48 2
3-2000/7.48 3
4-0000/8.40 2
4-0000/8.40 2
4-0000/8.40 2
4-0000/8.40 2
4-0000/8.40 2
4-0000/8.40 2
4-0000/8.40 3
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