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I'm dealing with a large amount (30,000) files of about 10MB in size. Some of them (I estimate 2%) are actually duplicated, and I need to keep only a copy for every duplicated pair (or triplet). Would you suggest me an efficient way to do that? I'm working on unix.

There is an existing tool for this: fdupes

Restoring a solution from an old deleted answer.

How to remove duplicated files in a directory?, lines. For uniq to work, you must first sort the output. So, my current workflow is to open one of the files, find the line that has email_webdev:, and then delete it and the next 42 lines, save the file, open the next, wash , repeat, for some 200 files. I'm looking for a one-liner or script that will automatically remove an ordered set of identical 42 lines from all of the files in which they appear.

you can try this snippet to get all duplicates first before removing.

find /path -type f -print0 | xargs -0 sha512sum | awk '($1 in seen){print "duplicate: "$2" and "seen[$1] }(!($1 in  seen)){seen[$1]=$2}' 

Remove duplicate lines from a text file, How do I copy a file from one directory to another in Linux? Now if you wish the script to automatically find and remove duplicate files then you can remove the highlighted block in the above script and just use del_file $FILE1 so it will directly remove duplicate files (if found) Script 2: Remove duplicate files using shell script Here we will use awk to find duplicate files using shell script.

I would write a script to create a hash of every file. You could store the hashes in a set, iterate over the files, and where a file hashes to a value already found in the set, delete the file. This would be trivial to do in Python, for example.

For 30,000 files, at 64 bytes per hash table entry, you're only looking at about 200 megabytes.

Find and Replace Duplicate Files in Ubuntu 18.04 LTS, It is a free tool used to find duplicate files across or within multiple directories. It uses checksum and finds duplicates based on file contains not  $ awk '!a [$0]++' file Unix Linux Solaris AIX This is very tricky. awk uses associative arrays to remove duplicates here. When a pattern appears for the 1st time, count for the pattern is incremented. This will still make the count as 0 since it is a post-fix, and the negation of 0 which is 'True' makes the pattern printed.

Find possible duplicate files:

find DIR -type f -exec sha1sum "{}" \; | sort | uniq -d -w40

Now you can use cmp to check that the files are really identical.

4 Useful Tools to Find and Delete Duplicate Files in Linux, I'm working on Linux, which means the is the command md5sum which outputs: > md5sum * d41d8cd98f00b204e9800998ecf8427e file_1  What would file manipulation be without the ability to delete files? Never fear; UNIX can delete anything that you throw at it. Use the rm (short for remove) or rmdir (short for remove directory) command to delete a folder or file. For example, to delete MyNewDocument from the Desktop folder, execute the rm command like this: rm ~/Desktop/MyNewDocument

Write a script that first compares file sizes, then MD5 checksums (caching them, of course) and, if you're very anxious about losing data, bites the bullet and actually compares duplicate candidates byte for byte. If you have no additional knowledge about how the files came to be etc., it can't really be done much more efficiently.

How to remove duplicate files using bash, In each iteration, compare the file contents with the other file's contents by using the command md5sum . If the MD5 is the same, then remove the file. For example, if file b is a duplicate of file a , the md5sum will be the same for both the files. Here is my task : I need to sort two input files and remove duplicates in the output files : Sort by 13 characters from 97 Ascending Sort by 1 characters from 96 Ascending If duplicates are found reta | The UNIX and Linux Forums

Remove identical files in UNIX, This comprehensive guide describes how to find and delete duplicate files using different tools in Unix-like operating systems. Below is the file name, I want to remove this file abc cde hjk.pdf when I'm using rm command,it's show me below lines,how to remove rm: cannot remove 'abc': No such file or directory rm: cannot re

How To Find And Delete Duplicate Files In Linux, FSlint is a great GUI tool to find duplicate files in Linux and remove them. FDUPES also find the files with same name in Linux but in the  sort command– Sort lines of text files in Linux and Unix-like systems. uniq command– Rport or omit repeated lines on Linux or Unix; Removing Duplicate Lines With Sort, Uniq and Shell Pipes. Use the following syntax: sort {file-name} | uniq -u sort file.log | uniq -u. Remove duplicate lines with uniq

How to Find Duplicate Files in Linux and Remove Them, Explains how to sort and remove duplicate lines from a text file under UNIX / Linux operating system using sort, uniq and shell pipes concept. I am doing KSH script to remove duplicate lines in a file. Let say the file has format below. FileA ----- 1253-6856 3101-4011 1827-1356 1822-1157 182 | The UNIX and Linux Forums

Comments
  • Duplicate can be based on the following 1. content 2. filename how do you want to do?
  • Content :-) Based on filename would be too easy
  • What's a metabyte? Some sort of idealised byte? And your solution only works if you have a perfect hash function.
  • What isn't a metabyte? Fixed. The paranoid could compare the contents of the files in the case of deleting. Adding an extra hash could also help.
  • @Neil If you use a modern, currently unbroken cryptographic hash function and you find a collision, your algorithm breaks down but you have gained a cryptographic paper, so it's all win. It is worth comparing the supposed duplicates before erasing one of them, though.
  • Proper cryptographic hash functions are not perfect by a simple counting argument, but you can treat them as they were for all intents and purposes.
  • @Pascal There certainly can be a collision. Consider that a file can be seen as a very large single binary number, much larger than the hash. Collisions are thus inevitable, because the hash loses information.
  • -w is a feature of gnu uniq; -d will only find consecutive duplicates, so you'd have to sort first
  • Instead of using -w (which is only in GNU, like the first comment said) you can pipe the output of sort to cut -d \ -f 1 and then pipe that to uniq -d. This is more portable. It will work on BSD, OS X, and other systems.
  • @monokrome: Err ... no. That would just give you the checksums without the file names. If don't have GNU uniq, you'll have to use awk and it's associative arrays to simulate uniq.
  • It's a high-througput download from different sources, so I got some redundancy. I'll try md5sum, so I should get a hashcode for all of them. I'll let you know if it works :-)
  • you might want to consider the algorithmical complexity of that particular approach...