Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!rutgers!njin!uupsi!sunic!dkuug!daimi!datpete
From: datpete@daimi.aau.dk (Peter Andersen)
Newsgroups: comp.unix.shell
Subject: deleting some empty lines with sed
Message-ID: <1991Apr27.143519.26256@daimi.aau.dk>
Date: 27 Apr 91 14:35:19 GMT
Sender: datpete@daimi.aau.dk (Peter Andersen)
Reply-To: datpete@daimi.aau.dk (Peter Andersen)
Organization: DAIMI: Computer Science Department, Aarhus University, Denmark
Lines: 20

I have some source-files that I produce documentation from.

I use sed to make a few changes to the text. I have figured
most of it out, but I have one problem remaining:
If two or more blank lines appear, I want to remove all but
one of these.

I have tried the following sed script

    s^ *$//p
1,$ N
    s/\(\n\n\)\n*/\1/gp

but it didn't work.

Does anyone have a way of doing this, perhaps using something
else but sed. I'm not a perl-guru, but if its possible in perl
I'd like to hear about that too.

Peter