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VSearch sorting (version 2.8.3.0)
(--sortbylength)
(--topn)
(--relabel)
(--sizeout)

What it does

Fasta entries are sorted by decreasing abundance (−−sortbysize) or sequence length (−−sort- bylength). To obtain a stable sorting order, ties are sorted by decreasing abundance and label increasing alpha-numerical order (−−sortbylength), or just by label increasing alpha-numerical order (−−sortbysize). Label sorting assumes that all sequences have unique labels. The same applies to the automatic sorting performed during chimera checking (−−uchime_denovo), derepli- cation (−−derep_fulllength), and clustering (−−cluster_fast and −−cluster_size).

Sorting options
--maxsize INT maximum abundance for sortbysize
--minsize INT minimum abundance for sortbysize
--output FILENAME
 output FASTA file
--relabel STRING
 relabel with this prefix string after sorting
--sizeout add abundance annotation to output
--sortbylength FILENAME
 sort sequences by length in given FASTA file
--sortbysize FILENAME
 abundance sort sequences in given FASTA file
--topn INT output just top n seqs after sorting

For details about this tool, please refer to the GitHub repository or the vsearch manual.