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fstyp_vxfs - return the type of file system on a specified disk partition


fstyp [-v] special




fstyp determines the type of file system on a disk partition. If no options are specified and special contains a Veritas file system, the standard output displays:


The file system-specific versions of fstyp check for the identifying characteristics of a file system. If the appropriate file systems are present, fstyp displays the type string for the file system on standard output and returns an exit code of zero. If the appropriate file system is not found, fstyp returns a non-zero exit code.

In the case of a Veritas file system, fstyp checks for a VxFS super-block, specifically, the fs_magic field of the super-block, to determine whether it is VX_MAGIC. If a VxFS file system is found, vxfs is displayed on standard output. The fs_vxfs (4) manual page describes the super-block format.

Cluster File System Issues

No cluster issues; command operates the same on cluster file systems.



Specifies the character or block disk device.


Specifies verbose mode. Displays the super-block fields, the number of free blocks and inodes, and the number of free extents by size. The output for -v differs slightly depending on the disk layout. For a Version 4 disk layout, fields such as logstart , logend , and nau are zero. The number of allocation units can be determined from the file system size field and the aulen field. For Version 4 disk layouts, all allocation units are the same size (as shown by aulen) except for the last allocation unit, which can be smaller.