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789.Text file splitter -- How to split a csv file according to the value of column A?

User: editor -- 2011-05-27          << 788  790 >>
Hits: 468
Type: Text file splitter   
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Description:
How to split a csv file according to the value of column A?
After splitting, need to use column A as filename. Note that the lines with same value in column A are adjacent.
Input Sample:
File: input.csv
user1,aaa
user1,bbb
user1,ccc
user2,ddd
user2,eee
user3,fff
user3,ggg
Output Sample:
File: user1.csv
user1,aaa
user1,bbb
user1,ccc

File: user2.csv
user2,ddd
user2,eee

File: user3.csv
user3,fff
user3,ggg
Answer:
Hint: You need to Download and install "Replace Pioneer" on windows platform to finish following steps.
1. ctrl-o open source csv file
2. ctrl-h open 'replace' dialog
* set 'replace unit' to 'Line'
* set 'replace with pattern' to:

* set 'If' to:

3. click 'Replace'
4. click "File-> SaveAs->Split by Paragraph" menu
* set "Para start" to "other", and set the following entry to:
* set "Para end" to "None"
5. click "Next", and input a filename in target folder, and click "Save", the csv file will be splitted to multiple csv files.

(Note: if you have installed "Replace Pioneer 2.68" or newer version, following easier example and answer is recommended:
http://www.mind-pioneer.com/services/879_Text_file_splitter.html)

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