chunk-string.sh

#!/bin/bash

f=TAATAGGTTTGGGGAAAATAGGGCAAGGGAAATTAAAGCAATTAATAAGACTGCGAAGCCTAGTAGATCTTTGTAGGAGAAGTATGGGTGGAAGGAAATTTTGTCTGCATCTGAATTAAGTCCTGTGGGGTTGTTAGACCCTGATTCATGGAGAAAAATAAGATGTACTAGTGTGGCACCTGCAATTACAAAGGGAAATAAGAAGTGGAATGTAAAGAATCGTGTAAGGGTAGCATTGTCGATAGAGAAGCCCCCTCAGATTCATTGGACTAGAGCATCCCCCACATAGGGGAAAGCTGATAGAAGGTTAGTAATGACTGTGGCTCCTCAGAATGACATTTGACCTCAAGGTAGTACGTAACCTACAAAAGCTGTCATTATTACTAGTAGAAGTAGTACTACTCCCACATTTCAGGTTTCTTTGTAAAGGTAGGAACCATAATAAAGACCCCGGCCAATGTGGAGATAAATGCAGATAAAGAAAAATGAAGCTCCGTTAGCGTGTATGTTTCGGATTATTCAGCCGTAATTTACATCTCGGCAGATGTGGGTAACAGATGAAAATGCCGTAGAAATATCTGATGTGTAGTGTATAGCAAGGAATAGCCCGGTAAGAATTTGTGCAATAAGGCAGAGGCCTAATAGA

echo length ${#f}

for i in $(seq 0 60 ${#f}); do
  echo ${f:$i:60}
done

#--------------------------------------------------
# for i in seq 0 ${#f}; do
#   echo $i
#   #echo ${f:$i:60}
# done
#--------------------------------------------------