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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: 90
Type: Advanced search and replace   
Search all Advanced search and replace examples
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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