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Re: Redirect to variable


From: Chet Ramey
Subject: Re: Redirect to variable
Date: Mon, 21 May 2018 10:12:43 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

On 5/20/18 10:21 PM, PePa wrote:
> I would like to do something like this, where output gets redirected
> into a variable:
> 
> some-command >>> variablename1 2>>>variablename2
> 
> command-with-many-output-descriptors >>> var1 3>>> var3 4>>> var4
> 
> The idea is not needing files to be created but to just use memory. Half
> a year ago I posted this idea here, but didn't get any reply, maybe this
> isn't the right place? Am I blacklisted??

It's not possible, in general, to open a file descriptor to an arbitrary
block of memory, especially given file descriptor inheritance between
processes.

What you're asking for is syntactic sugar for:

some-command > temp-file
echo '#' >> temp-file
variablename=$(< temp-file)
rm -f temp-file
variablename=${variablename%?}

I would look at a sample implementation, possibly using mmap, if someone
did one.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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