Deleting parts of text file

[hedvule]

I have a following problem:
I have a text file, I have to read each row and if it fullfills some conditions delete this line. The file looks like this:
1234 472 890
278 9009 12.348
etc.

I have to check e.g. 1234+472+890 > 7899 ?
If yes, delete this line! Is it possible within this file or is it better to write a new file just with "good" lines?

Thanks, Hedvule.

 

[Salem]

> Is it possible within this file
Well you could rewrite the line to just contain spaces....

> or is it better to write a new file just with "good" lines?
That's probably the more usual way of doing it.

BTW, this can be done usign a 1-line 'AWK' program

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