The -orfstyle and ‑mincodons options control ORF identification. The ‑output option specifies the output filename.
The -ntout output file is a FASTA filename for nucleotide sequences.
The -aaout output file is a FASTA filename for translated (amino acid) sequences.
Example
usearch -fastx_findorfs reads.fastq -ntout -nt.fa -aaout
aa.fa -orfstyle 7 -mincodons 16