[Haskell-cafe] Standard output of exec

Michael Snoyman michael at snoyman.com
Thu Dec 11 09:18:31 UTC 2014

You can use readProcess[1], but it has some downsides:

1. Can't specify all options to CreateProcess, e.g., working directory and
environment variables.
2. Relies on lazy I/O

I use Data.Conduit.Process[2] for this kind of thing, which has a full
tutorial[3]. However, it *does* involve non-base dependencies.


On Thu Dec 11 2014 at 11:11:12 AM Ernesto Rodriguez <neto at netowork.me>

> Dear All,
> I have a program which invokes an external program via exec. I wish to
> capture the standard output of the program without using external
> (temporary) files. Is it possible to create an in memory handle which I can
> tell exec to use as standard output of the invoked program. It would be
> great if it can be done without any extra dependencies.
> Best,
> --
> Ernesto Rodriguez
> Masters Student
> Computer Science
> Utrecht University
> www.netowork.me
> github.com/netogallo
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