Through terminal on Linux, what exactly would I type to find External HDDs and their remaining storage space?
Linux doesn't differentiate between external and internal drives in any obvious way* – so you'll need to get a bit sneaky to get what you want.
Let's start with the most common scenario – you're running a desktop Linux install, and the drive was mounted for you by some helper program – in which case your drive might have a mount point that looks like
If you mounted it manually, you'd know the location – and generally this would be under
So, if you start with:
… which would give you Disk Free, Human readable, and filtered the output to any entry whose
* On some older kernels, with the older ATA driver, PATA hard drives were denoted by