Howto eject usb media like "Safely Remove Drive" from CLI

gio mount --eject /media/nekomatu/$(drive-name)

I use Ubuntu 18.04(Bionic).
Ubuntu is doing mount automatically when USB removal media is connected PC.It's convinient. and un-mount is easy. only one-click eject button from filer. so I want to eject like filer from CLI.

`gio mount --eject /media/nekomatu/45e1dd0a-f7c`
やったー！行けましたっ。

What's gio? って感じだったのですが、次のとおりでした。
% gvfs-mount
This tool has been deprecated, use 'gio mount' instead. https://t.co/a3GdLev5zz

— nekomatu (@nekomatu) 2018年9月21日