Main tool : datasets and dataformat
Full documentation: https://www.ncbi.nlm.nih.gov/datasets/docs/v1/how-tos/
Use NCBI Datasets to gather metadata, download data packages, view reports and more (version 14.7.0)
# will download the fasta for ON924087.1 in a zipped directory
datasets download virus genome accession ON924087.1 --filename ON924087.1.zip
# unzipping the directory and the fasta file will be located at ncbi_dataset/data/genomic.fna
unzip ON924087.1.zip
# copying the file into something with a better name
cp ncbi_dataset/data/genomic.fna ncbi_dataset/data/ON924087.1.genomic.fna