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DPIPE(1)                FreeBSD 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
       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>.

Virtual Distributed Ethernet   December 6, 2006                       DPIPE(1)

NAME | SYNOPSIS | DESCRIPTION | EXAMPLE | OPTIONS | NOTICE | SEE ALSO | AUTHOR

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