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DPIPE(1)                    General Commands Manual                   DPIPE(1)



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 out-
       put  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  alter-
       nate  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 Ether-
       net.

EXAMPLE
       dpipe a = b
       processes  a  and  b  are bidirectionally connected: stdin of a is con-
       nected 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, std-
       out 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 Tech-
       nologies").

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

AUTHOR
       VDE is a project by Renzo Davoli <renzoATcs.it>.



Virtual Distributed Ethernet   December 6, 2006                       DPIPE(1)