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>.