in reply to Text manipulation

It helps if you give us non-biologists context as to what data the files contain. If you had said they were FASTA format files then you might have got a "fasta" response geddit? :-)

You're essentially taking an entry from each file at a time, but you could do this by reading each file into an array, and unshifting an entry off each array as d1 and d2 and then doing: 

print <<EOF;
$d1
$d2
========
EOF

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Re^2: Text manipulation
by frozenwithjoy (Priest) on Nov 09, 2012 at 19:19 UTC
    Nice pun!

    For anyone that doesn't know, FASTA format is a flat-file way to store any number of DNA/RNA/protein sequences and each entry consists of (1) a sequence ID line that starts with a '>' character and (2) one or more lines containing the actual sequence.

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