Thanks Wind. I really appreciate your help. Okay, while I was playing around with perl code, I found something interesting. Probably you can explain it to me in better way. I was trying to use get() for a webquery. Something like below:

$url = "http://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=$d
+b1&id=$query&retmode=text&rettype=abstract";
$data = get($url);

[download]

when I put $url in single quotes it doesn't work with the $db and $query but if I put it in double quotes it works. Why is it so, what is the relation between quotes and scalar quantity? It would be really nice if you can explain this to me. Thank you, Sammed

In reply to Re^4: Extracting Unique elements by smandape1
in thread Extracting Unique elements by smandape1

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