OK, I figured out the answer to the original question. Dismounting is the command "umount". It's not unmount, but umount, which is IMO really weird. Does anybody know how to authenticate from command line? When using the mount_webdav command from the terminal the Finder "Connect to Server" authentication window pops up. This was a surprise, since I assumed that it would be done through command line. Anyone know how to make it that way?