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dpipe - bi-directional pipe command


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


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.


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


no options.


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").

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