$ cat hairpin.fa | seqkit seq | seqkit stats file format type num_seqs sum_len min_len avg_len max_len - FASTA RNA 28,645 2,949,871 39 103 2,354 $ cat hairpin.fa | seqkit seq -m 100 | seqkit stats file format type num_seqs sum_len min_len avg_len max_len - FASTA RNA 10,975 1,565,486 100 142.6 2,354 $ cat hairpin.fa | seqkit seq -m 100 -M 1000 | seqkit stats file format type num_seqs sum_len min_len avg_len max_len - FASTA RNA 10,972 1,560,270 100 142.2 938