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From: leo@philmds.UUCP (Leo de Wit)
Newsgroups: comp.editors,comp.unix.questions
Subject: Re: Re^2: SED Question
Keywords: sed, improvement, fix
Message-ID: <1003@philmds.UUCP>
Date: 13 Apr 89 22:00:08 GMT
References: <2360001@hpcuhc.HP.COM> <38564@bbn.COM> <2292@solo11.cs.vu.nl>
Reply-To: leo@philmds.UUCP (Leo de Wit)
Organization: Philips I&E DTS Eindhoven
Lines: 54

In article <2292@solo11.cs.vu.nl> maart@cs.vu.nl (Maarten Litmaath) writes:
    []
|My first sed attempt can easily be fixed to handle partial matches at EOF
|properly:
|
|sed -n '
|        /^PROMPT>$/{
|		$p
|                h
|                n
|                H
|                /^>$/{
|			$b eof
|                        n
|                        /^<$/b
|                        H
|                }
|		: eof
|                g
|        }
|        p
|'

I think you'll need a third attempt 8-). It still doesn't handle correct
a series of lines like 

      PROMPT>
      PROMPT>
      >
      <

or one like

      PROMPT>
      >
      PROMPT>
      >
      <

Alternative:

sed -n '
: start
$p
$q
N
/^PROMPT>\n>\n<$/d
/\n[^\n]*\n/{
    P
    D
}
b start'

    Leo.