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Why do I obtain different output results with blast vs awk commands

I have an awk command that identifies 30 pb from two multifasta files. When I used two input files: E.g. 100 sequences each, I get the same result with the ...
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group samples based on shared mutations in a single multi samples vcf file

I am learning about vcf file formatting and have a multi-sample (>300) vcf file and aim to group (take) samples with shared mutations. Can someone suggest a tool/command/script solve this problem?
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Metagenome simulation from a concatenated FASTA file

I am trying to simulate metagenome sequencing. So I will start with a file with a lot of concatenated genomes. From there, I would like to randomly extract 10,000 sequences of length 200bps. I got ...