[issue16689] stdout stderr redirection mess

[Charles-François Natali]

Charles-François Natali added the comment:

To be more specific, for performance reasons, you definitely don't
want stdout to be line buffered when redirected to a file, but fully
buffered.
It makes sense to have stderr unbuffered or line buffered either way
to make sure that errors get printed - right away.
See http://www.delorie.com/gnu/docs/glibc/libc_226.html for an explanation.

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