[Haskell-beginners] how to save the GHC errormessages in a file on Windows

Federico Mastellone fmaste at gmail.com
Thu Apr 28 17:37:38 CEST 2011

If you want all the output (stdout and stderr) to be redirected
together, doing "&>filename" redirects both stdout and stderr.
You can also redirect stderr to stdout by doing "2>&1" and then
redirecting the stdout to the file you need.

On Thu, Apr 28, 2011 at 10:04 AM, Daniel Fischer
<daniel.is.fischer at googlemail.com> wrote:
> On Thursday 28 April 2011 14:31:29, Kees Bleijenberg wrote:
>> When I try in Windows in cmd: ghc --make myprogram.hs > test.txt I only
>> get the first lines in test.txt. The errormessages itself are on the
>> screen, not in test.txt.
>> In test.txt:
>> Resolving dependencies...
>> Configuring ftphs-1.0.7...
>> Preprocessing library ftphs-1.0.7...
>> Preprocessing executables for ftphs-1.0.7...
>> Building ftphs-1.0.7...
>> The errormessages: Could not find  module 'Network.FTP.Client'.... and a
>> lot more.
>> How do I 'intercept' these messages?
> The error messages are printed to stderr, while the others are printed to
> stdout. I'm not sure how it works on Windows, but on unix or linux, you'd
> redirect stderr with
> $ command 2> file.txt
> It's worth a try on Windows too, I think.
>> Kees
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Federico Mastellone
Computer Science Engineer - ITBA
".. there are two ways of constructing a software design: One way is
to make it so simple that there are obviously no deficiencies, and the
other way is to make it so complicated that there are no obvious
deficiencies. The first method is far more difficult."

Tony Hoare, 1980 ACM Turing Award Lecture.

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