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fstyp(8)

fstyp(8)                System Administration Commands                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 un‐
       known_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 parti‐
       tion.

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  at‐
             tributes:


                 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"ele‐
             ment 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 dam‐
                                 aged 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.


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       tab()  box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
       TRIBUTE VALUE _ Availabilitysystem/core-os


SEE ALSO
       libfstyp(3LIB), hsfs(4FS), pcfs(4FS), ufs(4FS), attributes(7), fsck(8),
       mkfs_ufs(8), tunefs(8)

NOTES
       The use of heuristics implies that the result of fstyp is  not  guaran‐
       teed 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  parti‐
       tion.

Oracle Solaris 11.4               10 Mar 2023                         fstyp(8)
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