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DPIPE(1) General Commands Manual DPIPE(1) 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 out- put 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 alter- nate 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 Ether- net. EXAMPLE dpipe a = b processes a and b are bidirectionally connected: stdin of a is con- nected 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, std- out 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 Tech- nologies"). 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>. Virtual Distributed Ethernet December 6, 2006 DPIPE(1)
NAME | SYNOPSIS | DESCRIPTION | EXAMPLE | OPTIONS | NOTICE | SEE ALSO | AUTHOR
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