man/man8/fstyp.8

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 FSTYP 8 "June 20, 2021"
 NAME
fstyp - determine file system type
 SYNOPSIS
fstyp [-a | -v] special [:logical-drive]


 DESCRIPTION
fstyp allows the user to determine the file system type of unmounted file
systems using heuristic programs.

An fstyp module for each file system type to be checked is executed; each
of these modules applies an appropriate heuristic to determine whether the
supplied special file is of the type for which it checks. If it is, the
program prints on standard output the usual file system identifier for that
type (for example, ``ufs'') and exits with a return code of 0; if none of
the modules succeed, the error message unknown_fstyp (no matches) is
returned and the exit status is 1. If more than one module succeeds, the
error message unknown_fstyp (multiple matches) is returned and the exit
status is 2. Other errors are printed in the same format.

This command is unreliable and its results should not be used to make any
decisions about subsequent use of a storage device or disk partition.
 OPTIONS
-a

Output all available file system attributes. If a file system has been
successfully identified, and this option is specified, the FSType
identifier is followed by one or more "name-value" pairs, one per line, in the
format:
name: value


The following conventions are recognized for the file system attributes:


String values are put in single quotes.


Nested "name-value" list increases the indentation of its values by four
whitespaces.


For an array of "name-value" pairs, one array entry is printed per line, with
the index following the name in square brackets.

For instance, in the following example, "top_list" is a "name-value"
list, consisting of a string array "string_array" and a "name-value" list
array "list_array". The second "list_array" element is an integer array
"int_array" containing three elements.
top_string: 'String'
top_list:
 string_array[0]: 'S0'
 string_array[1]: 'S1'
 list_array[0]:
 int_one: 1
 string_two: 'S2'
 list_array[1]:
 int_array[0]: 1
 int_array[1]: 2
 int_array[2]: 3


In addition to the FSType-specific attributes, the following generic
attributes may be present:
gen_clean

Allowable values are "true" or "false". If the value is "false", the file
system is damaged or was not unmounted cleanly and the fsck(8) command
must be run before this file system can be mounted.


gen_guid

Globally unique identifier. This string uniquely identifies the file system.


gen_version

A string describing the file system version.


gen_volume_label

Volume label, a human-readable string used to either describe or identify the
file system.


-v

Produce verbose output. This is usually information about the file systems
superblock and varies across different FSTypes. See ufs(4FS),
mkfs_ufs(8), and tunefs(8) for details.


 USAGE
See largefile(7) for the description of the behavior of fstyp when
encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
 SEE ALSO
 libfstyp (3LIB),  hsfs (4FS),  pcfs (4FS),  ufs (4FS),  attributes (7),  largefile (7),  fsck (8),  mkfs_ufs (8),  tunefs (8)  NOTES
The use of heuristics implies that the result of fstyp is not guaranteed
to be accurate.

This command is unreliable and its results should not be used to make any
decisions about subsequent use of a storage device or disk partition.