Re: uniq on open streams

[Andreas Krey <a.krey%gmx.de@localhost>]

On Tue, 23 Apr 2019 11:50:23 +0000, Greg A. Woods wrote:
...
> 
> Thinking "Oh, so it should work on FreeBSD too...", I opened a window to
> my recently installed FreeBSD-12.0 machine, and after rewriting the Lua
> code into AWK, I was surprised to see absolutely no output at all!

stdout buffering is a thing. awk may not flush stdout, esp. when
stdout is not a terminal. So uniq may not get anything.

  (echo a; echo b; echo c; sleep 3) | uniq -c

is test case enough, and doesn't have the stdout buffer issue.

- Andreas

-- 
"Totally trivial. Famous last words."
From: Linus Torvalds <torvalds@*.org>
Date: Fri, 22 Jan 2010 07:29:21 -0800