s3cmd is the standard tool to access S3. Yet it isn’t packaged for MSYS2. Here are the steps to use it nonetheless.

Install

# Need to install extra python packages
pacman -S mingw-w64-ucrt-x86_64-python mingw-w64-ucrt-x86_64-python-dateutil mingw-w64-ucrt-x86_64-ca-certificates

cd s3cmd
git clone https://github.com/s3tools/s3cmd
./s3cmd --configure

Usage

See https://s3tools.org/usage