FSTYP(1M)                                               FSTYP(1M)



     NAME
          fstyp - determine file system identifier

     SYNOPSIS
          fstyp special

     DESCRIPTION
          fstyp allows the user to determine the file system
          identifier of mounted or unmounted file systems using
          heuristic programs. The file system type is required by
          mount(2) and sometimes by mount(1M) to mount file systems of
          different types.

          The directory /etc/fstyp.d contains a program for each file
          system type to be checked; each of these programs applies
          some 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 and exits with a return code of 0;
          otherwise it prints error messages on standard error and
          exits with a non-zero return code. fstyp runs the programs
          in /etc/fstyp.d in alphabetical order, passing special as an
          argument; if any program succeeds, its file-system type
          identifier is printed and fstyp exits immediately. If no
          program succeeds, fstyp prints "Unknown_fstyp" to indicate
          failure.

     WARNING
          The use of heuristics implies that the result of fstyp is
          not guaranteed to be accurate.

     SEE ALSO
          mount(1M).
          mount(2), sysfs(2) in the Programmer's Reference Manual.

     ORIGIN
          AT&T V.3


















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