 .  ,       -
 ,   ,    
 ,   ,    .
       /dev   . -
     :    
  ,         -
 . ,     cat   
/dev/dsp     .   
  ,   Is -1   /dev:

$ Is -I /dev

crw-   1 root sys       14,   4 Apr 17 2004 audio
.crw-   1 root root       5,   1 Jan 22 08:31 console
crw   1 root root       5, 64 May 5 2004 cuaO
crw-   1 root root       5, 65 May 5 2004 cual
brw-rw   1 root floppy     2,   0 May 5 2004 fd0
brw-rw   1 root floppy     2, 12 May 5 2004 fdOD360
brw-rw   1 root floppy     2, 16 May 5 2004 fdOD720
brw-rw   1 root floppy     2, 28 May 5 2004 fdOH1440
brw-rw   1 root floppy     2, 12 May 5 2004 fdOH360
brw-rw   1 root disk       3,   0 May 5 2004 hda
brw-rw   1 root disk       3,   1 May 5 2004 hdal
brw-rw-   1 root disk       3,   2 May 5 2004 hda2
brw-rw-   1 root disk       3,   3 May 5 2004 hda3
brw-rw   1 root disk       3,   4 May 5 2004 hda4
brw-rw-   1 root disk       3,   5 May 5 2004 hda5
brw-rw-   1 root disk       3,   6 May 5 2004 hda6

       -, , , d, 1     
 ,  ,  , , -
     (.  ).  -
     ,      -
      . ,       -
    ,       
   (. ),  .   -
     Is -1 (.  "Is -1:   "  6).

  FIFO ( )

  FIFO,     (named pipe),
 :           
.  FIFO    "first in, first out" ( , 
)     .   , -
    ,    , 
  .         -
           , 
       .

      ,    
   FIFO.     -

460                                       IV.  