my %hash =(
          'script' => 'foo.pm',
          'params' => {
                             'err' => '99',
                             'FILE' => 'fileA'
                       },
          'par_global' => {
                                'err' => '99',
                                'err' => '20',
                                'FILE_READ' => 'fileB',
                           },
           'testset' => ['test1']
        );

[download]

I am extracting key value pairs from %hash, but in case if key=values are similar, it should pick only one entry of it rather than picking both the entries.

Output from my code FILE=fileA err=99 script:foo.pm foo.pm FILE_READ=fileB err=99 err=20 testset:test1

Output required FILE=fileA err=99 script:foo.pm foo.pm FILE_READ=fileB err=20 testset:test1

Should list only one entry of err=99 rather than two entries

Code used 

foreach my $key (keys %hash) {
    if ( ref $hash{$key} ne 'HASH' && ref $hash{$key} ne 'ARRAY' ) {
        print"$key:$hash{$key}\n";
        if( (defined $key) && ($key eq 'script') ) {
            print"$hash{$key}\n";
        }
    }
    if( ref $hash{$key} eq 'HASH' ) {
        foreach my $k (keys %{$hash{$key}}) {
            print"$k=$hash{$key}{$k}\n";
        }
    } elsif( ref $hash{$key} eq 'ARRAY' ) {
        print"$key:$hash{$key}[0]\n";
    }
}

[download]

In reply to Remove similar key=value pair from HOH by vaibhav07

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