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sed delete but save deleted output into other file

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# 1  
Old 04-29-2012
sed delete but save deleted output into other file
Hi guys, I am currently using this to save first 50 lines into top50.txt and delete them from list.txt ... it's 2 commands:

Code:
head -n 50 list.txt > top50.txt && sed -i "1,50 d" list.txt

I want to change that so it's 1 command - whereby sed removes the first 50 lines as above but that which is removed gets saved to top50.txt - so no need for the head command as I am doing....

Can that be done? Thanks in advance!
# 2  
Old 04-29-2012
I'm not at all sure it can be done with sed. awk, yes. May I ask why? You already have one line that works, presumably.

Code:
awk 'NR<51 {print $0>"file1";next } NR>50 {print $0>"file2"} ' inputfile

# 3  
Old 04-29-2012
For sed, try:
Code:
sed -n '51,${p;d;};wtop50.txt' list.txt > rest.txt

# 4  
Old 04-30-2012
Hi, thanks for those solutions. I will try them out.

The purpose is to optimize the method I am doing. I think it's not as efficient as it could be.
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