--endpoint_url
flag, which is required when using s4cmd with Filebase.apt-get install s4cmd
mkdir ~/.aws
vi ~/.aws/credentials
s4cmd --endpoint-url=https://s3.filebase.com ls
s4cmd --endpoint-url=https://s3.filebase.com mb s3://filebase-sample-bucket
s4cmd --endpoint-url=https://s3.filebase.com cp image.jpg s3://filebase-sample-bucket
s4cmd --endpoint-url=https://s3.filebase.com cp s3://filebase-sample-bucket/image.jpg .