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").
vde_switch(1), vde_plug(1), vde_plug2tap(1), vdeq(1). wirefilter(1).
VDE is a project by Renzo Davoli <[email protected]>.