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FreeBSD 11.0 - man page for lsvfs (freebsd section 1)

LSVFS(1)						    BSD 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.
mount(2), getvfsbyname(3), mount(8)
A lsvfs command appeared in FreeBSD 2.0.
June 9, 2013 BSD