DPIPE
Section: User Commands (1)
Updated: December 6, 2006
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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>.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- EXAMPLE
-
- OPTIONS
-
- NOTICE
-
- SEE ALSO
-
- AUTHOR
-
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|
- Running on 
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