Output parameters
As the output of the assembly process is a number of contigs/sequences, you must provide the name of the FASTA file they should be written to. This is done using the -o/--output parameter.
If you want to filter out short contigs before they are written to the output file, you can specify a cut-off using the -m/--min-length parameter (default 500). Contigs below that length will not be output.