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sed to cp lines x->y from 1.txt into lines a->b in file2.txt

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# 1  
Old 03-17-2011
sed to cp lines x->y from 1.txt into lines a->b in file2.txt
I have one base file, and multiple target files-- each have uniform line structure so no need to use grep to find things-- can just define sections by line number.

My question is quite simple-- can I use sed to copy a defined block of lines (say lines 5-10) from filename1.txt to overwrite an equally sized block of lines (lines 25-30) in filename2.txt.

Put another way, I have file1.txt that looks like:

Code:
AAAA
BBBB
1111
2222
3333
CCCC

and want to copy the lines with numbers into similarly formatted lines with numbers in file 2 (but not with matching starting line numbers).

Code:
DDDD
EEEE
FFFF
GGGG
4444
5555
6666
HHHH
IIII
JJJJ

I have been able to do this within an individual file, but haven't been able to bridge the two.
# 2  
Old 03-17-2011
what would be the desired output based on your sample input file?
# 3  
Old 03-17-2011
Quote:
Originally Posted by vgersh99
what would be the desired output based on your sample input file?
Code:
DDDD
EEEE
FFFF
GGGG
1111
2222
3333
HHHH
IIII
JJJJ

# 4  
Old 03-17-2011
Code:
nawk 'FNR==NR {if ($1~"^[0-9][0-9]*$")f1[++n1]=$0;next}$1~"^[0-9][0-9]*$"{$0=f1[++n2]}1' file1 file2

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