What command may I use to list the currently mounted filesystems on a Unix system?
You could try
If you have something you'd like to do but don't know what command to use to do it, use the
mount command is the first one listed on my OpenBSD system.
Reading its manual:
The system maintains a list of currently mounted file systems. If no arguments are given to
mount, this list is printed.
There are more than one possibility for that. I prefer: (as root or with
lsblk -f. It shows the device name, the filesystem, the UUID, and the mount point, and is well formated to read it. You can simply use
mount but this shows also the virtual filesystems like
/tmpfs and so on.