Rsync mishap .. OS hdd is now full I attempted to use the command:

sudo rsync -vaE --progress /Volumes/1-mate /Volumes/Hired-Hand


.. to move the contents of one connected drive to another. This was going great until my boot drive filled all the way up (150mb free now).

The problem is that I mistyped the name of the destination.. should have been "HiredHand" NOT "Hired-Hand". 

I am clueless where the copied files were placed and need to delete them so that I can use my computer again. Please help!

I am using macOS. Cannot locate any threads anywhere that deal with this issue.. other than someone 3 years ago on stack exchange saying "they found the files" and all is well now for them.

Thank you.
There is nothing inherently magically going on within /Volumes. So if you use rsync or something else to copy data into that folder, it will just do as told. If there is no folder with the target name already it will just create a new one on your main drive. 

So

sudo rm -rf /Volumes/Hired-Hand


should remove the files/folders created by rsync. Just make sure you get the name right (and maybe eject the HiredHand drive first).