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FSTYP(8) FreeBSD System Manager's Manual FSTYP(8)

determine filesystem type

fstyp [
] [
] [
] special

The fstyp utility is used to determine the filesystem type on a given device. It can recognize ISO-9660, exFAT, Ext2, FAT, NTFS, and UFS filesystems. When the -u flag is specified, fstyp also recognizes certain additional metadata formats that cannot be handled using mount(8), such as geli(8) providers, and ZFS pools.
The filesystem name is printed to the standard output as, respectively:
  • cd9660
  • exfat
  • ext2fs
  • geli
  • msdosfs
  • ntfs
  • ufs
  • zfs
Because fstyp is built specifically to detect filesystem types, it differs from file(1) in several ways. The output is machine-parsable, filesystem labels are supported, the utility runs sandboxed using capsicum(4), and does not try to recognize any file format other than filesystems.
These options are available:
In addition to filesystem type, print filesystem label if available.
Ignore file type. By default, fstyp only works on regular files and disk-like device nodes. Trying to read other file types might have unexpected consequences or hang indefinitely.
Include filesystems and devices that cannot be mounted directly by mount(8).

The fstyp utility exits 0 on success, and >0 if an error occurs or the filesystem type is not recognized.

file(1), capsicum(4), autofs(5), geli(8), glabel(8), mount(8), zpool(8)

The fstyp command appeared in FreeBSD 10.2.

The fstyp utility was developed by Edward Tomasz Napierala <> under sponsorship from the FreeBSD Foundation. ZFS and GELI support was added by Allan Jude <>.
April 26, 2017 FreeBSD 12.0-RELEASE

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