sed question...

[Gary Kline]

On Tue, Sep 25, 2007 at 01:05:06PM -0400, Howard Goldstein wrote:
> 
> 
> Giorgos Keramidas wrote:
> > On 2007-09-24 20:52, Gary Kline <kline at tao.thought.org> wrote:
> >   
> >> On Mon, Sep 24, 2007 at 11:07:20PM -0400, Howard Goldstein wrote:
> >>     
> >>>>  # delete the last 10 lines of a file
> >>>>  sed -e :a -e '$d;N;2,10ba' -e 'P;D'   # method 1
> >>>>  sed -n -e :a -e '1,10!{P;N;D;};N;ba'  # method 2
> >>>>
> >>>> 	Question two, can sed do its thing inline?
> >>>>         
> >>> Wouldn't it be easier to use  head -n 18 ?
> >>>       
> >
> > If you _know_ that the file has 28 lines, yes.  If you don't,
> > then itmay be tricky to 'guess' that -n 18 is the right option.
> >
> >   
> In the bits you snipped he said he wanted to ditch everything after the
> 18th line. 

	Not 'xactly.  Given a file of, say 200 line, I want to exact 
	just the middle.  Roughly everythiing after #155, and from the 
	end, -19 to the EOF.

> 
> I didn't realize complexity was the goal.  Is this a homework assignment
> Gary?


	Errm, only working toward one, Howard.
-- 
  Gary Kline  kline at thought.org   www.thought.org  Public Service Unix
      http://jottings.thought.org   http://transfinite.thought.org