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POSIX

        512 -k  1024 -P file FIFO

GNU

        file df

POSIX

       -k      512  1024

       -P     `Filesystem N-blocks Used Available Capacity Mounted  on'   6  (
              N=512-k  N=1024)

GNU

       -a, --all
               0  `ignore'  `auto'  ()

       -h, --human-readable
                M 10  2 M  1,048,576

       -i, --inodes
               inode

       -k, --kilobytes
               1024  1

       -l, --local

       -m, --megabytes
               (1,048,576 )

       -t fstype, --type=fstype
               fstype -t  --all

       -v      (System V df )

       -x fstype, --exclude-type=fstype
               fstype -x  --all

       -H, --si
               M (SI) 2  10 M  1,000,000

       -P, --portability
              POSIX  a), b), c) a)  1  1  20 () b) c)  POSIX

       -T, --print-type
               mount(8)

       --block-size=SIZE
               SIZE

       --no-sync
               sync(2) df  ( SunOS )

       --sync  sync(2)  ( SunOS ) df ( )

GNU

       --help

       --version

       --

        1024  (POSIXLY_CORRECT 512 )  --block-size=SIZE

              DF_BLOCK_SIZE, BLOCK_SIZE, POSIXLY_CORRECT.

          human-readable    si    B   D   `BLOCK_SIZE=1KB'   `BLOCK_SIZE=1024'
       `BLOCK_SIZE=1KD'  `BLOCK_SIZE=1000'

        ( --human-readable --si )

       k      : --human-readable  2^10 = 1024 --si  10^3 = 1000

       M      : 2^20 = 1,048,576  10^6 = 1,000,000

       G      : 2^30 = 1,073,741,824  10^9 = 1,000,000,000

       T      : 2^40 = 1,099,511,627,776  10^12 = 1,000,000,000,000

       P      : 2^50 = 1,125,899,906,842,624  10^15 = 1,000,000,000,000,000

       E      :     2^60     =     1,152,921,504,606,846,976      10^18      =
              1,000,000,000,000,000,000

       Z      :     2^70     =    1,180,591,620,717,411,303,424     10^21    =
              1,000,000,000,000,000,000,000

       Y      :   2^80   =    1,208,925,819,614,629,174,706,176     10^24    =
              1,000,000,000,000,000,000,000,000

         DF_BLOCK_SIZE,  BLOCK_SIZE,  POSIXLY_CORRECT  LANG, LC_ALL, LC_CTYPE,
       LC_MESSAGES

       POSIX 1003.2

       mount(8)

        fileutils-4.1 df ;  aeb@cwi.nl,  aw@mail1.bet1.puv.fi,  ragnar@ragnar-
       hojland.com  bug-fileutils@gnu.org