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How to remove duplicate lines in two large text files by number of appearance?

By : Stefanie Melo
Date : July 30 2020, 02:00 PM
Hope this helps How can you avoid reading 2 × 12 GB into memory at once, but still process all the data?
By loading those 24 GB chunk by chunk, and discarding data you don't need anymore as you go. As your files are line-based, reading and processing line-by-line seems prudent. Having 4000-ish characters in memory at once shouldn't pose a problem on modern personal computers.
code :
with \
        open("A.txt") as a_file, \
        open("B.txt") as b_file, \
        open("AB.txt", "w") as ab_file:
    for a_line, b_line in zip(a_file, b_file):
        # get rid of the line endings, whatever they are
        a_line, = a_line.splitlines()
        b_line, = b_line.splitlines()

        # output the combined content to AB.txt
        print(f"{a_line}\t{b_line}", file=ab_file)

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Fastest way to remove duplicate lines in very large .txt files

By : Deepak Khandelwal
Date : March 29 2020, 07:55 AM
I hope this helps . You could try a bloom filter. While you may get some false positives (though you can get arbitrarily close to 0% at the cost of more processing) it should be pretty fast as you don't need to compare or even do a log(n) search for each line you see.

Remove all lines after an 4 digit number from a large number of .txt files

By : NeedHelpSchool
Date : March 29 2020, 07:55 AM
this one helps. The Regex 1(?:[4-8]\d\d|900)(?:.|[\r\n])+\z will select a text starting with 1400-1900 till the end of a file.

How to remove duplicate lines from a large text file efficiently?

By : Ho Nhat Tan
Date : March 29 2020, 07:55 AM
Hope this helps Before you write your data, if your data is in a list or dictionary, you could run LINQ query and use group by to group all like keys. Then for each write to the output file.
Your question is a little vague as well. Are you creating a next text file every time and do you have to store the data in text? There are better formats to use such as XML and json

How can I combine multiple text files, remove duplicate lines and split the remaining lines into several files of certai

By : BELOUCH Mustapha
Date : March 29 2020, 07:55 AM
Any of those help You have asked about Notepad++ and are thus using Windows. On the other hand, you said you want to create a program if needed, so I guess the main goal is to get the job done.
This answer uses Unix tools - on Windows, you can get those with Cygwin.
code :
cat file1 file2 file3 | sort -u | split -l1000000 - outfile_
cat * | sort -u | split -l1000000 - outfile_
cat file1 file2 file3 | grep -v '^\s*$' | sort -u | split -l1000000 - outfile_
cat * | sort -u | split -l1000000 - outfile_

Compare text files in C# and remove duplicate lines

By : P.A.
Date : March 29 2020, 07:55 AM
this will help Here's a simple solution that works for your example files. It doesn't have any error checking for if the file is in a bad format.
code :
using System;
using System.Collections.Generic;

class Program
    class entry
        public string origin;
        public string destination;
        public DateTime time;
        public double price;

    static void Main(string[] args)
        List<entry> data = new List<entry>();

        //parse the input files and add the data to a list
        ParseFile(data, args[0], ',');
        ParseFile(data, args[1], '|');

        //sort the list (by price first)
        data.Sort((a, b) =>
            if (a.price != b.price)
                return a.price > b.price ? 1 : -1;
            else if (a.origin != b.origin)
                return string.Compare(a.origin, b.origin);
            else if (a.destination != b.destination)
                return string.Compare(a.destination, b.destination);
                return DateTime.Compare(a.time, b.time);

        //remove duplicates (list must be sorted for this to work)
        int i = 1;
        while (i < data.Count)
            if (data[i].origin == data[i - 1].origin
                && data[i].destination == data[i - 1].destination
                && data[i].time == data[i - 1].time
                && data[i].price == data[i - 1].price)

        //print the results
        for (i = 0; i < data.Count; i++)
            Console.WriteLine("{0}->{1}->{2:yyyy-MM-dd HH:mm}->${3}",
                data[i].origin, data[i].destination, data[i].time, data[i].price);


    private static void ParseFile(List<entry> data, string filename, char separator)
        using (System.IO.FileStream fs = System.IO.File.Open(filename, System.IO.FileMode.Open))
        using (System.IO.StreamReader reader = new System.IO.StreamReader(fs))
            while (!reader.EndOfStream)
                string[] line = reader.ReadLine().Split(separator);
                if (line.Length == 4)
                    entry newitem = new entry();
                    newitem.origin = line[0];
                    newitem.destination = line[1];
                    newitem.time = DateTime.Parse(line[2]);
                    newitem.price = double.Parse(line[3].Substring(line[3].IndexOf('$') + 1));
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