illumos: manual page: fstyp.8

FSTYP(8) Maintenance Commands and Procedures FSTYP(8)

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:

o String values are put in single quotes.

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

o 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).

NOTES