Re: pipelines

["Marijn Schouten (hkBst)" <hkBst@gentoo.org>]

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Andy Wingo wrote:
> Hi Marijn,
> 
> On Sat 28 Mar 2009 05:53, "Marijn Schouten (hkBst)" <hkBst@gentoo.org> writes:
> 
>> how would I construct a pipeline with guile? Currently my best attempt which
>> turns to nothing is:
>>
>> guile> (use-modules (ice-9 popen))
>> guile> (with-output-to-port (open-pipe "echo" OPEN_WRITE) (lambda ()
>> (with-input-from-port (open-pipe* OPEN_READ "echo" "Hello world") (lambda ()
>> (display (readline))))))
> 
> What do you mean by "pipeline"? Do you want to spawn off "echo foo |
> bar", or write data to "bar", or read data from "echo foo" ?
> 
> Andy

By pipeline I mean for example:

echo "Hello world" | cat | cat | cat | grep world | cat

I know how to create such pipelines that contain only a single pipe. My question
is about how to do it when there are many pipes.

Marijn

- --
Gods do not want you to think, lest they lose existence.
Religions do not want you to think, lest they lose power.

Marijn Schouten (hkBst), Gentoo Lisp project, Gentoo ML
<http://www.gentoo.org/proj/en/lisp/>, #gentoo-{lisp,ml} on FreeNode
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