B2 (name tbd) is a command-line tool for interacting with Backblaze's B2. It is similar to their B2 CLI tool written in Python, but it's faster and more user-friendly (a.k.a. not just showing the JSON responses from the api as the output)
# All subcommands and arguments are visible with
b2 --help
# Authorise the user via stdin prompts
b2 authorise
# List the buckets that the user can see
b2 list-buckets
# List the files in the buckets
b2 ls
b2 ls -l
# Upload a file into b2
b2 <file> <bucket> [dest]
# Download a file from b2
b2 <file> <bucket>
b2 <file> <bucket> -O <output>