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Fold the FASTA sequences with length $ fold -w 100 genome.fa #Fasta #Genome #Fold #Break #Length

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

Fasta sequence length: awk '/^>/ {if (seqlen){print seqlen}; print ;seqlen=0;next; } { seqlen += length($0)}END{print seqlen}' file.fa #Length #Linux #OneLiner