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Hello Teju,

Welcome to Perlmonks! There are several problems in your program/data:

You have "sample_ID.txt" but you open "sample_IDs.txt"
Your ID file contains two columns but you only want the first column in your FASTA processing
No die statements to tell you about failed file I/O
You use \n> as your input record separator (Look for $/ in perlvar) but you're still processing those opening '>' in fasta tags.
You are wiping out most of "useful" information from your FASTA processing. So your expected output doesn't match. If I'm reading your program right, you'd be getting those DNA sequences - nothing else.

So, if you fix all of those things - you should be on your way (to glory or otherwise!).

Here's my program fixed up mostly for clarity/readability:

In reply to Re: A program to extract the reads and modify the seq ID by robby_dobby
in thread A program to extract the reads and modify the seq ID by Teju

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