I'm sure there are more elegant and probably better solutions, but this is one way to do it. 

#!/usr/bin/env perl
use strict;
use warnings;

my %fields;
my $header = <DATA>;
while (<DATA>) {
    chomp;
    next if /\A\s*\Z/;
    my ($f1, $f2) = split;
    push @{ $fields{$f1} }, $f2;
}

for my $k (keys %fields) {
    my ($one, $three) = (0, 0); # if either of these remain zero, ID i
+s invalid

    for my $values ( @{ $fields{$k} } ) {
        ++$one   if ( $values == 1 );
        ++$three if ( $values == 3 );
    }

    print "invalid ID: $k\n" unless $one * $three;
}

__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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In reply to Re: validating file with perl by farang
in thread validating file with perl by mmittiga17

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