Count the contigs length in index fasta file with samtools. $ awk '{s+=$2}END{print s}' scaffolds.fasta.fai #Fasta #Index #Length #Count #Size #Samtools
#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