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I need to merge two very large lists together.


  • Washington|
  • Ohio|
  • Dublin|
  • London|
  • Milan|


  • Greg
  • Tom
  • Paul
  • Sharon
  • Bill


  • Washington|Greg
  • Ohio|Tom
  • Dublin|Paul
  • London|Sharon
  • Milan|Bill

How can I do that in Windows?

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Pretty much any program that compares two files and allows you to merge the differences can do something like this. – Ramhound Feb 15 '13 at 14:25
@Ramhound All the programs like that I have used will let you overwrite one line with another, but I've never run into a program that will append lines together, I could be wrong though, and I always like to learn new things, could you expand your comment into an answer explaining how to do this? – David Feb 15 '13 at 14:36
@Ramhound most merge programs just overwrite the differences rather than appending. – Ninja2k Feb 15 '13 at 14:42
See: Merge 2 txt files in a single tab delimited file in batch. In Unix, you'd have paste for that. – slhck Feb 15 '13 at 14:50

I got a working solution. Pasted the rows to Excel and exported it as text file, rather than an XLS file.

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If it's not too much data you should be able to do this with something like MS Office or LibreOffice. Load the two text files, cut n paste them into different columns in a spreadsheet (Col A for file 1, col b for file 2) then cut and paste (special, raw text) back into a text doc.

It's not pretty but it will work with some manual work on your part.

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I am afraid its 10K of data :( – Ninja2k Feb 15 '13 at 14:46

You can do that with the paste command line utility that comes with my Hamilton C shell. If this is a one-time thing, you'll be happy with the free version of my C shell. Full disclosure: I'm the author.

paste -d \0 File1.txt File2.txt > Output.txt

Here's what it looks like on your data:

176 C% cat File1.txt
177 C% cat File2.txt
178 C% paste -d \0 File1.txt File2.txt

Cygwin also includes a paste but to use that one, you'll need to ensure that all the lines end with only a newline (\n) character, Unix-style, not a carriage return-newline (\r\n) combination Windows-style or you'll get this:

179 C% \cygwin\bin\paste -d \0 File1.txt File2.txt

(The Cygwin paste treats the \r as an ordinary character. On the screen, it moves the cursor to the beginning of the line, overwriting what was there.)

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command line, var 1:

powershell $f1=gc File1.txt;$f2=gc File2.txt;for($i=0;$i-lt$f1.length;$i++){$f1[$i]+$f2[$i]}>Output.txt

command line, var 2:

powershell $f1=gc File1.txt;$f2=gc File2.txt;for($i=0;$i-lt$f1.length;++$i){$f1[$i]+$f2[$i]^>^>Output.txt}


$f1=gc File1.txt;$f2=gc File2.txt;for($i=0;$i-lt$f1.length;++$i){$f1[$i]+$f2[$i]>>Output.txt}
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