Trabalho com bioinformática e queria tirar uma dúvida com vocês Tou com essas sequências de DNA, cada '>' representa uma sequência Quero verificar apenas as três primeira letras de cada sequência, por shel script tem como?
>fig|674.13.peg.56 gtgacgttaggtgacaatgttgttgttgcctcgggagccgttgtgacaaagagttttggt agcaatgttgtcattggtggcaacccagcacgagtgttaaaagaaatcgagtaa >fig|674.13.peg.57 atgtcaatatacccaactgcaccccaaggtgtgtcagttgatgccaatatgaaaatgata aagcaaaagtttggccgcattgttggcccaactgatttctattggttttatgaacaggtt agaaataaaggcccgtgggattataaacaaagtggcccgtttgaaaatttcggtaatttt cattatggggcagttggttatgcaggtggcattccagaagaagttttgttaagagctgct ggttgtgctcaaatgaaggcgggtacttcagctgatagctggggtagttgttggagcgat caaccatttggagatgatccaaacgatcaacgttatatagcactaggtattgaatatgca aaaagtaaaggctattag >fig|674.13.peg.58 atgaacgtggataaagcgaaaaaacgcatattgaaacgagtacaaagaggtttcaaaggt tatccgcaaatatctttagagtatttcgggaaaacgacagattttgctaccgaagtagtc atcacttttgttcctgaagaaaacgctgaagcgcaaattcagagatttacgagtgataag gatgttcgtgaagatgaagcaattcaatcggtattgttgaaaattattgagcgagccgac gctgctacggttttagaaagccgagaagtatcagtttgttaa >fig|674.13.peg.59 atgccagttgttggacaccttcaagtggtgacaaattgggatggtataccgatttgtatt atagaaatgacgtctgtaaccaagcaaaaatacagcgaagtaacaccggagttcgcggct ttagaaggtgagggtgacaagactttagcttggtggcgggaggcgcattggaacttcttc tcaaaagagtgcgtagagttagaaatatcaccgtcggaagatatgttgctggttctagag cagttcaaagtggtgtacaaataa
