#Convert a #multi-line #fasta to a #singleline #fasta $ awk '!/^>/ { printf "%s", $0; n = "\n" } /^>/ { print n $0; n = "" } END { printf "%s", n }' sample1.fa > sample1_singleline.fa
MultiLine fasta to oneline fasta converter awk '/^>/ {printf("\n%s\n",$0);next; } { printf("%s",$0);} END {printf("\n");}' < file.fa #Multiline #Oneline