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sed flat file manipulation

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# 1  
Old 12-11-2014
sed flat file manipulation
Hello, I have a large flat file where i need to change data in columns 131-133 based on what is in columns 172-173. I am not sure if I need to read the file line by line and make the change or if I can do this in a single statement. thank you
# 2  
Old 12-11-2014
If you want to do the change in every line, you'll need to read and modify every single line.
# 3  
Old 12-11-2014
ok thank you
# 4  
Old 12-11-2014
But, the program to read every single line, modify it, and write it back out might still be a single line.

If you'd give us sample input, a description of the rules that specify what changes are to be made, and sample output; we might be able to help you solve your problem.
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