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 http://mywiki.wooledge.org/BashFAQ/009
