Set of useful Scripts and Oneliners

grep -v '^>' input.fa | tr -d '\n' | fold -w 100 | nl -n rz -s '' | sed "s|^|>|" | sed "s||\n|" > output.fa

pyfasta split -n 1 -k 100 -o 0 chr1.fa

-n Number of output files -k length -o Overlap

|awk '/^ACCESSION / {printf(">%s\n",$2);next;} /^ORIGIN/ {inseq=1;next;} /^/// {inseq=0;} {if(inseq==0) next; gsub(/[0-9 ]/,"",$0); printf("%s\n",$0);}' | head -n 30