- 
Select which database you want to download, here I will use the nucleotide database: nt. 
- 
Using rsync we will retrieve the name of the files composing the database from the NCBI server 
rsync --list-only rsync://ftp.ncbi.nlm.nih.gov/blast/db/nt*.gz
- Using grep we filter the Warning/Welcome message and retain only the compressed files
rsync --list-only rsync://ftp.ncbi.nlm.nih.gov/blast/db/nt*.gz | grep '.tar.gz'
