if the header is always that format, then you wouldn't need to store the whole header, as it just becomes a contiguous sequence of increasing integers...and hence $Sequences[1] is already known to be for header "Seq1" implicitly. And if the headers are not that straight forth, then depending exactly on the processing required, probably opt for a hash of array or array of hashes, which keeps the header directly tied to the sequence, rather than separate header and separate sequence data structures.
the hardest line to type correctly is: stty erase ^H

In reply to Re: Bioinformatic task by aquarium
in thread Bioinformatic task by uvnew

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