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Date: Mon, 1 Jul 2002 17:34:03 -0700 (PDT)
From: Rob Anderson <rob@isilon.com>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: bin/40101: sed buffers one line of output before writing to stdout
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>Number:         40101
>Category:       bin
>Synopsis:       sed buffers one line of output before writing to stdout
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jul 01 17:40:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Rob Anderson
>Release:        4.5-STABLE
>Organization:
Isilon Systems Inc.
>Environment:
FreeBSD beasly.isilon.com 4.5-STABLE FreeBSD 4.5-STABLE #3: Thu Apr 18 15:58:15 PDT 2002 toor@beasly.endurantsystems-internal.com:/usr/src/sys/compile/ROB  i386
>Description:
sed buffers a full line before writing to stdout. For example, if I enter "sed 's/foo/bar/'" at the prompt, I get the following interaction:

blah   <--- I enter this, get no response
foobar <--- I enter this...
blah   <--- suddenly, the response to my 'blah' is printed
stuff  <--- I enter this...
barbar <--- now, the response to 'foobar' is printed

This is _not_ the behavior in Linux sed...Linux sed prints out every line as it is processed. 'perl -pe' also prints out lines as they are processed. Only BSD sed exhibits this property. I couldn't find anything in the manpage that explains why BSD sed behaves this way.
>How-To-Repeat:
See above... repeats every time. Just run sed with any command, and you'll get this behavior.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:

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