Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!ucsd!sdics!wallen
From: wallen@sdics.ucsd.EDU (Mark Wallen)
Newsgroups: comp.unix.wizards
Subject: Re: A little help with SED please - cla
Message-ID: <495@sdics.ucsd.EDU>
Date: 22 Apr 88 07:20:50 GMT
References: <142700030@occrsh.ATT.COM> <146@gsg.UUCP>
Organization: Institute for Cognitive Science, UC San Diego
Lines: 35
Summary: an adjustment to the echo '' | ex - version


In article <146@gsg.UUCP> lew@gsg.UUCP (Paul Lew) writes:
>
> > I need an sed line (or some gory pipeline) to extract the data between
> >                      ^^^^^^^^^^^^^^^^^^^^^^
> > BEGIN and END.
> > 
[Elided--mrw]
>It is very simple to do if the lines contain BEGIN or END should be
>included:
>
>   (1) awk '/BEGIN/,/END/' filename		
>
>It is a bit tricker if you want to exclude BEGIN, END lines:
>
>   (1) awk '/END/ {p=0} p==1 {print} /BEGIN/ {p=1}' filename	or
>   (2) echo '/BEGIN/+1,/END/-1p' | ex - filename		or
>   (3) sed -n '/BEGIN/,/END/{/BEGIN/d;/END/d;p;}' filename
[Elided--mrw]

Wither have the 'ed' hackers of yore gone?  I suppose they're
all 'ex' hackers now :-).  If you change (2) to
echo 'g/BEGIN/.+1,/END/-1p' | ex - filename
(or ed instead of ex), you'll get all data between BEGIN,END
pairs EXCEPT when there is no data.  I.e.,
	BEGIN
	END

Both editors abort on this case (ed with the wonderfully
informative "?" message; thank zeus that some things haven't
changed :-)

Mark R. Wallen
UC San Diego

mwallen@ucsd.edu