I have a Linux CentOS system.
Is there any way to upload music from the command line to Google Music?
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...Google finally released an uploader designed just for Linux.
The uploader essentially works just like the Windows version, with one small tweak: OGG support. OGG files will automatically be transcoded to 320kbps MP3 files, which will inevitably make the already painfully slow uploading process last even longer -- but hey, at least you can finally use that beta invite, right?
To grab the uploader, head over to the Google Music Landing page, hit 'Download the Music Manager', select the appropriate package based on your Linux distro, and install.
I think what you appear to be looking for is https://github.com/thebigmunch/gmusicapi-scripts - a set of python scripts to upload, download or bi-directionally sync tracks. This, in turn, draws from https://github.com/simon-weber/Unofficial-Google-Music-API should you wish to use these python libraries for your own projects.
I've just provided this exact same answer to "uploading music automatically with Google Music on a Linux server"
No, you need Google Music Manager which isn't on Linux yet, unfortunately.
However this guy did have a way to upload from linux (apart from using wine) but ever since the "hack" he used got patched it stopped working. In his most recent comment he writes
"Now the only way to upload that i’m aware of is by sending that protobuf encoded https post to a certain site."
eh. Maybe someone else knows, but it'd probably be easiest to wait for Google.