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NAME

       dpipe - bi-directional pipe command

SYNOPSIS

       dpipe [ command [ args ] ] = [ command [ args ] ]
       dpipe  [ command [ args ] ] = [ command [ args ] ] [ = [ command [ args
       ] ] ] ...

DESCRIPTION

       dpipe is a general tool to run  two  commands  diverting  the  standard
       output  of  the first command into the standard input of the second and
       vice-versa.  It is the bi-directional extension of the | (pipe)  syntax
       used  by  all  the  shells.  The = has been chosen as a metaphor of two
       parallel communication lines between the commands.  It is also possible
       to  concatenate  several tools. Intermediate programs communicate using
       standard  input  and  standard  output  with  the  preceding  tool  and
       alternate  standard  input  and  output  (respectively file descriptors
       number 3 and 4) towards the following tool.  If  an  intermediate  tool
       should  process  only  the  data flowing in one direction use { or } as
       suffix for the preceding = and prefix of the following one.
       This tool has been written  as  a  tool  for  the  Virtual  Distributed
       Ethernet.

EXAMPLE

       dpipe a = b
       processes  a  and  b  are  bidirectionally  connected:  stdin  of  a is
       connected to stdout of b and vice-versa
       dpipe a = b = c
       a and b are connected as above. Alternate stdin of b  is  connected  to
       stdout of c and alternate stdout of b to stdin of c
       dpipe a =} b }= c
       This  is  a  cycle  of  pipes:  stdout of a is connected to stdin of b,
       stdout of b with stdin of c, and stdout of c to stdin of a
       dpipe a =} b }={ c {= d = e
       all the notations can be mixed together.  this is a -> b -> d -> c  and
       back to a; alternate ports of d are connected to e

OPTIONS

       no options.

NOTICE

       Virtual Distributed Ethernet is not related in any way with www.vde.com
       ("Verband der Elektrotechnik, Elektronik und Informationstechnik"  i.e.
       the  German  "Association  for  Electrical,  Electronic  &  Information
       Technologies").

SEE ALSO

       vde_switch(1), vde_plug(1), vde_plug2tap(1), vdeq(1).  wirefilter(1).

AUTHOR

       VDE is a project by Renzo Davoli <renzo@cs.unibo.it>.



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