Hello, I have a file which looks like this: 
Retire a document    Dokument deaktivieren
Remove a document from the knowledge base    Dokument aus der Knowledg
+e Base entfernen
Promote document retirement    Dokument deaktivieren
Document Expired    Dokument abgelaufen

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English and translated strings are separated by a tab character. I found this and managed to put together the following code to read the file into a hash array: 
use strict;
use warnings;

open (FILE, "extract_tab.txt") or die "$!\n";

my %hash;
while (my $line = <FILE>) {
    chomp($line);
    my ($enu, $deu) = split /\t/, $line;
    
    $hash{$enu} = $deu;
}

for my $key (keys %hash) {
print "$key\n";
}
for my $value (values %hash) {
print "$value\n";
}

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As far as I can tell, the hash is created correctly (otherwise please tell me), and the keys are populated by the English strings and the values by the translated ones.

I now want to identify those keys that have identical values, and print them out. Something like "English strings 'Retire a document' and 'Promote document retirement' have the same translation ('Dokument deaktivieren')". I have been trying along the lines of the answers provided to this post, but I am getting stuck. 

#my %seen;
for my $key (keys %hash) {
    my $value_key = "@{[values %{$hash{$key}}]}";
#print "$value_key\n";
}

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is giving me this error: Can't use string ("Dokument aus der Knowledge Base ") as a HASH ref while "strict refs" in use at hashtest.pl line 18, <FILE> line 4. Could someone help me understand? Or any hints for a different approach if it makes things easier? Thanks.

In reply to Find duplicate values in hash by moff

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