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LSVFS(1) General Commands Manual LSVFS(1)

lsvfs — list installed virtual file systems

lsvfs [vfsname ...]

The lsvfs command lists information about the currently loaded virtual file system modules. When vfsname arguments are given, lsvfs lists information about the specified VFS modules. Otherwise, lsvfs lists all currently loaded modules. The information is as follows:

Filesystem
the name of the file system, as would be used in the type parameter to mount(2) and the -t option to mount(8)
Num
the filesystem type number.
Refs
the number of references to this VFS; i.e., the number of currently mounted file systems of this type
Flags
flag bits.

Show information about the ‘ufs’ and devfs(5) filesystems and check the number of mounts for the former:

$ lsvfs ufs devfs
Filesystem                              Num  Refs  Flags
-------------------------------- ---------- -----  ---------------
ufs                              0x00000035     2
devfs                            0x00000071     1  synthetic, jail

$ mount -t ufs | wc -l
       2

mount(2), getvfsbyname(3), mount(8)

A lsvfs command appeared in FreeBSD 2.0.

December 28, 2020 FreeBSD-13.0