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POTo find the matched and unmatched values in perl
 

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    <p>I am a newbie to programming and I hope someone can explain this to me:</p> <p>So I have two text files i.e. Scan1.txt and Scan2.txt that are stored in my computer. Scan1.txt contains:</p> <pre><code>Tom white black mark john ben </code></pre> <p>Scan2.txt contains:</p> <pre><code>bob ben white gary tom black patrick </code></pre> <p>I have to extract the matched values of these two files and the unmatched values and print them separately. I somehow found the solution for this which works fine. But can someone please explain how exactly the match happens here. Looks like somehow just this line: <code>$hash{$matchline}++</code> in the code does the matching and increments the value of hash when the match is found. I understand the logic but I do not understand how this match actually happens. Can someone help me understand this?</p> <p>Thank you in advance!</p> <p>Here is the code:</p> <pre><code>open (F1, "Scan1.txt"); open (F2, "Scan2.txt"); %hash=(); while ($matchline= &lt;F1&gt; ){ $hash{$matchline}=1; } close F1; while( $matchline= &lt;F2&gt; ){ $hash{$matchline}++; } close F2; foreach $matchline (keys %hash){ if ($hash{$matchline} == 1){ chomp($matchline); push(@unmatched, $matchline); } else{ chomp($matchline); push (@matched, $matchline); } } print "Matched Entries are &gt;&gt;\n"; print "```````````````````````\n"; print join ("\n", @matched) . "\n"; print "```````````````````````\n"; print "Unmatched Entries are &gt;&gt;\n"; print "```````````````````````\n"; print join ("\n", @unmatched) . "\n"; print "```````````````````````\n"; </code></pre>
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