df(1)                                                       df(1)



NAME
     df - reports the used and unused storage capacity for a file
     system

SYNOPSIS
     df -t [-f] [-T fs-type] [fs-reference]...

     df -B [-i] [-T fs-type] [fs-reference]...

     df -p [-i] [-T fs-type] [fs-reference]...

ARGUMENTS
     -B   Lists the free disk blocks in the BSD style of output
          format.

     -f   Computes the number of blocks in the free list (for
          SVFS file systems only).

     fs-reference
          Specifies the file system to query. The reference can
          be constructed in terms of a file or directory that
          resides on the file system you want to query or in
          terms of a device file that corresponds to the file
          system you want to query.

     -i   Lists statistics regarding inodes along with everything
          else reported.  This option can only be used with the
          -p and -B options.

     -p   Lists the free disk blocks in the POSIX style of output
          format (POSIX User Portability Extension).

     -t   Reports the total allocated block and inode figures
          along with everything else.  This option is not
          available when the -p or -B options are used.

     -T fs-type
          Establishes the type of file system as
          file-system-type.  The accepted types are:  4.2 and
          5.2.  See fstab(4) for more detailed information
          regarding file system types.

DESCRIPTION
     df reports the current state of a file system in terms of
     its data storage capacities.  You may specify the file
     system reference (fs-reference) in two ways.  File systems
     may be specified either as device files (for example,
     /dev/dsk/c0s0d0) or as filenames (for example, /usr).  If
     fs-reference is given in the form of a regular file or
     directory, df reports on the amount of free space for the
     file system on which that file resides.  Without any
     arguments, df displays the amount of free blocks and free



January 1992                                                    1

df(1)                                                       df(1)



     inodes for all of the mounted file systems.

     For file systems based upon the Berkeley Software
     Distribution (BSD) model, the remaining free space is
     calculated differently depending on whether you are using
     the root account or not. The root account is always allowed
     access to all the available disk blocks.  Because BSD file
     systems cannot be used effectively without a residual amount
     of free disk space, most users are denied access to a fixed
     percentage of the disk blocks.  The amount by which free
     blocks are reduced for normal users is controlled through a
     tunefs(1M) parameter.  However, you should not reduce this
     parameter to less than five percent because of the increased
     possibility of fragmentation resulting in impaired
     performance.

LIMITATIONS
     Since inodes are file system dependent, the number of inodes
     reported on remotely mounted file systems is always zero.

FILES
     /bin/df
          Executable file
     /dev/dsk/*
          Disk partition device files
     /etc/mtab
          File containing list of currently mounted file systems

SEE ALSO
     mount(1M) in A/UX System Administrator's Reference fs(4),
     fstab(4), mtab(4) in A/UX Programmer's Reference
























2                                                    January 1992