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Re: weird bash pipe behavior

From: Greg Wooledge
Subject: Re: weird bash pipe behavior
Date: Thu, 21 Jan 2010 08:18:59 -0500
User-agent: Mutt/

On Wed, Jan 20, 2010 at 07:34:35AM -0800, CptDpondo wrote:
> mencoder .... 2>&1 | tr '\r' '\n' | grep -v -B 1 '^Pos'
> this eventually creates the correct output, but it's buffered until
> mencoder completes.  I have no idea why; the tr command streams
> without buffering and I've used grep for years and never run into this
> behavior.

grep definitely has this buffering behavior.  If you're using GNU grep,
you can give it the --line-buffered option to change this, at least
according to whichever contributor added that one to

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