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1399.Advanced search and replace -- How to merge lines with identical first row in two files?

User: y8888 -- 2017-08-12          << 1398  1400 >>
Hits: 2373
Type: Advanced search and replace   
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How do I merge the first row of the same line? 
Input Sample:
a file: 
111 test1 
2222 test2 
333 abc 
444 ppp 
5555 uuuuu 
b file: 
111 uuu 
111 bbb 
111 cc 
2222 aaaaa 
333 ttt
Output Sample:
111 test1;uuu;bbb;cc 
2222 test2;aaaaa 
333 abc;ttt
Hint: You need to Download and install "Replace Pioneer" on windows platform to finish following steps.
Assume your b.txt is in d:\test\ folder 
1. ctrl-o open a.txt 
2. ctrl-h open 'replace' dialgoue 
* set 'replace unit' to 'Line' 
* set 'replace with pattern' to: 
* click 'advanced’ tab, set 'run following at the beginning of replace' to: 
3. click 'replace', done. 
4. ctrl-s save to file.

Screenshot 1:  Replace_Window

Screenshot 2:  Replace_Advanced_Window

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