[ILUG] Opposite of Cat >>

[Stephen_Reilly at dell.com]

	'course another easy way of doing it would be to have a marker at
the end of each line. For example:
99,RestartStyleHint=3 #installfile
99,Priority=1 #installfile
99,RestartCommand=killall ooqstart  #installfile

then do "sed '/#installfile/d' filename" or "grep -v #installfile filename".


	Other than that to delete specific lines (having their line number
is handy) "sed '12,16d' filename" will remove lines 12 to 16 inclusive.
A full thing though not pretty would be...

sed `grep -n begin filename | cut -f1 -d:`,`grep -n end filename | cut -f1
-d:`d filename

steve

-----Original Message-----
From: Niall Sheridan [mailto:niall.sheridan at ormsby-rhodes.ie]
Sent: 10 June 2002 16:10
To: Stephen_Reilly at exchange.dell.com
Cc: ilug at linux.ie
Subject: Re: [ILUG] Opposite of Cat >>


On Mon, 10 Jun 2002 08:48:31 -0500
Stephen_Reilly at dell.com wrote:

> Why not have a backup of all modified files. Then for uninstall overwrite
> with original.
Configuration files can change significantly at any point in time between
the install and uninstall.

Niall

> steve
> 
> -----Original Message-----
> From: Stephen Shirley [mailto:diamond at skynet.ie]
> Sent: 10 June 2002 14:22
> To: Irish Linux Users Group
> Subject: Re: [ILUG] Opposite of Cat >>
> 
> 
> On Mon, Jun 10, 2002 at 12:57:06PM +0100, Brian Foster wrote:
> >  this is trivial to un-install --- just delete all lines
> >  between (and including) the two magic marker lines.
> >  numerous tools can do this, sed(1) is perhaps a good
> >  choice 
> 
> I'm just wondering, could you give a snippet of sed code to demonstrate
> this? I've used sed for line editing lots of times, but anything more
> complex, and the man page maketh no sense to me. I've even tried looking
> for example sed scripts on the sed homepage, but no joy. Therefore, for
> this sort of thing, i'd use sed, cause i know how -)
> 
> Steve
> -- 
> "Oh look, it's the Pigeon of Love."
> 
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