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#!/bin/bash
f=TAATAGGTTTGGGGAAAATAGGGCAAGGGAAATTAAAGCAATTAATAAGACTGCGAAGCCTAGTAGATCTTTGTAGGAGAAGTATGGGTGGAAGGAAATTTTGTCTGCATCTGAATTAAGTCCTGTGGGGTTGTTAGACCCTGATTCATGGAGAAAAATAAGATGTACTAGTGTGGCACCTGCAATTACAAAGGGAAATAAGAAGTGGAATGTAAAGAATCGTGTAAGGGTAGCATTGTCGATAGAGAAGCCCCCTCAGATTCATTGGACTAGAGCATCCCCCACATAGGGGAAAGCTGATAGAAGGTTAGTAATGACTGTGGCTCCTCAGAATGACATTTGACCTCAAGGTAGTACGTAACCTACAAAAGCTGTCATTATTACTAGTAGAAGTAGTACTACTCCCACATTTCAGGTTTCTTTGTAAAGGTAGGAACCATAATAAAGACCCCGGCCAATGTGGAGATAAATGCAGATAAAGAAAAATGAAGCTCCGTTAGCGTGTATGTTTCGGATTATTCAGCCGTAATTTACATCTCGGCAGATGTGGGTAACAGATGAAAATGCCGTAGAAATATCTGATGTGTAGTGTATAGCAAGGAATAGCCCGGTAAGAATTTGTGCAATAAGGCAGAGGCCTAATAGA
echo length ${#f}
for i in $(seq 0 60 ${#f}); do
echo ${f:$i:60}
done
#with -r (extended) option:
s/(.{$len})/\1\n/g