12-03-2019
What would you expect? The first greps the lines with "done" in them and pipes it --- into nowhere! As the second opens the input file again to read from it and discards its stdin. You've been given examples of how to do it correctly.
Your desired output isn't too clear, at least to me.
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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 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>.
Virtual Distributed Ethernet December 6, 2006 DPIPE(1)