Sed problem

I want to erase the last two lines from a file. I am trying to do this with a "sed -n '$d' myfile" but this does nothing. Any help will be appreciated !
CyberGodAsked:
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ecwConnect With a Mentor Commented:
Just using sed ...
  sed '$d' myfile | sed '$d'

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ahoffmannCommented:
awk '{x[NR]=$0}END{while(n<NR-1){print x[n++];}}' file
sed -ne '1,'`wc -l file|awk '{print $1-2}'`' p' file
head -`wc -l x|awk '{print $1-2}'` file
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garbouaCommented:
I don't think I would use sed for that.

I would write a script like:

#!/bin/sh -p

# Find the number of lines in the file
numlines=`cat $1 | wc -l`

# Subtract 2 lines
numlines=`expr $numlines - 2`

# Copy the first 'numlines' to a temp file
head -$tocopy $1 > /usr/tmp/cpfile

# Move the temp file back over the original
mv /usr/tmp/cpfile $1

But that is just me :-)
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CyberGodAuthor Commented:
still not working
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ahoffmannCommented:
what is not working?

BTW, my 3'rd suggestion has a type, should be:
  head -`wc -l file|awk '{print $1-2}'` file
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ecwCommented:
I'm surprised
  sed '$d' myfile | sed '$d'
doesn't work, it does for me.  Do you really want to erase the last two lines from the file, or just remove the last two lines when "catting" the file.  Sed doesn't do in-situ editting.  For that, use ed(1), eg.
  echo '$-1,$d\nw\nq' | ed -s - myfile


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