| DPIPE(1) | General Commands Manual | DPIPE(1) |
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 <renzo@cs.unibo.it>.
| December 6, 2006 | Virtual Distributed Ethernet |