[Bioperl-l] comparing fasta sequences in multiple files

[robby jhones]

Dear Group,

 Can anyone offer advice on comparing multiple fasta sequences in many
files. We have 1000's of fasta sequences in individual files of which I
would like to fish out and print to a new file (the sequence and ID), ONLY
the sequences which appear in at least a few of the files: 3 out of 4 runs,
perhaps all 4 runs ( as some are replicates).

 Is there something out there which would do this?

Thanks for your helps
>>Robby