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How to convert Sars-CoV-2 ORF1ab codon positions to ORF1b positions?

ORF1ab:4588I corresponds to ORF1b:187I so one needs to subtract 4401 to go from ...
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Bedtools get fasta and ORF from a blastX run

Blast uses a 1-based coordinate system. Bed is 0-based half open. Your code needs to convert appropriately. See for example: https://www.biostars.org/p/317112/ .
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how to Know the longest ORF in Protein?

Proteins don't have ORFs, DNA sequences do. What DNA sequences do you have? If cDNA (i.e. transcript/mRNA) then an ORF finder will give multiple ORFs and the coordinates on the full-length input DNA ...
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