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


NAME

     fstyp - determine filesystem type


SYNOPSIS

     fstyp [-l] [-s] [-u] special


DESCRIPTION

     The fstyp utility is used to determine the filesystem type on a given
     device.  It can recognize BeFS (BeOS), ISO-9660, exFAT, Ext2, FAT, NTFS,
     UFS, HAMMER, and HAMMER2 filesystems.  When the -u flag is specified,
     fstyp also recognizes certain additional metadata formats that cannot be
     handled using mount(8).

     The filesystem name is printed to the standard output as, respectively:
           befs
           cd9660
           exfat
           ext2fs
           msdosfs
           ntfs
           ufs
           hammer
           hammer2

     Note that HAMMER filesystem consists of more than one volumes requires a
     path in blkdevs format.  See hammer(8) for blkdevs format.  fstyp doesn't
     recognize partially specified block devices as HAMMER filesystem volumes
     unless -u flag is specified.

     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, and does not try to recognize any file
     format other than filesystems.

     These options are available:

     -l     In addition to filesystem type, print filesystem label if
            available.

     -s     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.

     -u     Include filesystems and devices that cannot be mounted directly by
            mount(8).


EXIT STATUS

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


SEE ALSO

     file(1), autofs(5), hammer(8), hammer2(8), mount(8)


HISTORY

     The fstyp command appeared in FreeBSD 10.2.  The fstyp command appeared
     in DragonFly 4.5.


AUTHORS

     The fstyp utility was developed by Edward Tomasz Napierala
     <trasz@FreeBSD.org> under sponsorship from the FreeBSD Foundation.  ZFS
     and GELI support was added by Allan Jude <allanjude@FreeBSD.org>.

     The fstyp utility was ported to DragonFly by Tomohiro Kusumi
     <tkusumi@netbsd.org>.  Donated to DragonFlyBSD by PeerCorps Trust Fund.


BUGS

     The fstyp utility on DragonFly currently doesn't support zfs(8) pool and
     geli(8) providers supported on FreeBSD.

DragonFly 6.1-DEVELOPMENT       August 28, 2021      DragonFly 6.1-DEVELOPMENT

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