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1151.Text file parser -- How to extract 3,4,5th columns from csv file and replace comma with space?

User: Kun -- 2013-12-04          << 1150  1152 >>
Hits: 1232
Type: Text file parser   
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I need to extract 3,4,5th columns from a huge csv file and replace all the comma with space. I can do this with "cut" and "grep". But it will be fun to know how can i do this in RP~
Input Sample:
Output Sample:
121805.926987 206489.117478 357.377990
Hint: You need to Download and install "Replace Pioneer" on windows platform to finish following steps.
1. ctrl-o open csv file
2. ctrl-h open "replace" dialogue
* set "replace unit" to "Line"
* set "replace with pattern" to:

3. click "replace", done.
4. ctrl-s save to new file.

Screenshot 1:  Replace_Window

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