Finding unique files between 2 folders based on hash.

[Celestial92]

Hi, from what I understand, the filter provided below, from this thread, will allow you to bring up all files that exist in only one of two folders. In order to be regarded as a non-duplicate, a file in 'folder A' would need to have a combination of all three characteristics: name, size, and date modified, which don’t occur any file contained in folder B.

- Create the following filter:
Name = Difference between 2 folders (or whatever you like to name it)
Search =

Code: Select all

file:   regex:#regex-escape:<#element:<$param:,;,1>>(.*$) | regex:#regex-escape:<#element:<$param:,;,2>>(.*$)    unique:regmatch1;size;dm

Macro = diff

Back in the main window:
- Set the filter to Everything
- Search for:

Code: Select all

diff:"X:\first folder\";"Y:\second folder\"

The resultlist will show which files are either not on one of the 'sides' or have a different name, date modified or size

I’m wondering if there’s a way to do this with everything, but a file in folder A is only regarded as unique when it has a hash value, like SHA-1, which doesn’t occur in any file contained in folder B, and vice versa? I know that hashing all the files each time is time consuming, but there are a few rare instances where I would find it useful. The main reason is to not display results which are hash-duplicates but have different filenames.

Otherwise, is there any other software which would be better suited to those needs?

thanks

[kazzybash]

Not sure if I’m helping you with this, but maybe you could try ‘Alldup’ (you can search for duplicates by hash OR byte-by-byte AND/OR name). Regards, kazzy

[NotNull]

I think there is a solution using just Everything. When tested, it is largely working but there is an issue with the current iomplementation of the distinct: function. Or much more likely: my understanding of it.
When that is sorted out, will reply here (might take a couple of days).


The (planned) mechanism in short:
- filter out duplicates of hashes in the same folder ("c:\folderA\file.txt" and "c:\folderA\copy of file.txt" will have the same hash)
- list only unique hashes.

[Celestial92]

@NotNull Thanks for looking into it! Actually, I just remembered that there’s another feature I’d find useful with this. If a file is duplicated 2 or more times in folderA, but that same file doesn’t occur anywhere in folderB, then I’d also like that to show up as a unique result in the search. The main purpose is to make sure that all files which exist in one directory also exist in the other other directory, but some files have different filenames. Is that possible?

Thanks.

[NotNull]

The main purpose is to make sure that all files which exist in one directory also exist in the other other directory, but some files have different filenames

And that is exactly what it should do.
Will require an Everything update though. When that comes out, I will post a solution here.

[klarah]

Otherwise, is there any other software which would be better suited to those needs?

have a look at beyondcompare (https://www.scootersoftware.com/). it integrates into the context menu and is (as I find) the best "ADDON" to Everything to compare files and folders in detail.

[horst.epp]

Otherwise, is there any other software which would be better suited to those needs?

have a look at beyondcompare (https://www.scootersoftware.com/). it integrates into the context menu and is (as I find) the best "ADDON" to Everything to compare files and folders in detail.

The requested function is not anything BeyondCompare provides.
It's a very good compare tool, but not applicable here.

[Celestial92]

I had a look at beyond compare. It seems very close to what I was looking for, as you can show all the unique (orphan) files between 2 folders.
But yes, it doesn't seem to allow you to display the orphan files solely based on their hash value. Still looks very handy.

thanks

[horst.epp]

I had a look at beyond compare. It seems very close to what I was looking for, as you can show all the unique (orphan) files between 2 folders.

That is a function which most compare tool and file managers provide.

[klarah]

But yes, it doesn't seem to allow you to display the orphan files solely based on their hash value. Still looks very handy.

its a bit hidden, but under "Actions" is a function "compare Contents.." wich offers comparision by CRC or binary or other rules.

[NotNull]

I think the idea is to compare files, just based on the hash, so 'file1.txt' and 'copy of file1.txt' are considered the same, even when their names differ.
I vaguely remember that Beyond Compare will always include the name when comparing. Or is it possible to ignore the names?

[horst.epp]

I think the idea is to compare files, just based on the hash, so 'file1.txt' and 'copy of file1.txt' are considered the same, even when their names differ.
I vaguely remember that Beyond Compare will always include the name when comparing. Or is it possible to ignore the names?

In my older version, you can only set to ignore the extensions,
and use size and CRC as criteria.

[klarah]

i see... as i also have use of it i asked chatgpt this question:

"i have two folders with files. the name of the first is "1" and lays in the same path as the script i want you to write. the second folder i provide as argument. the script in python shell loop trought all files in both folders and calculates their checksum. as second step it shell remove all files in the folder "1" wich checksum does not exists in the second folder respectivly."

with only litle adoption i got a working script with the following usage:

Usage: python remove_crc_dupes.py <second_folder_path>

1. put a copy or a softlink of the files, you want to check for existance in <second_folder_path>, into <first_folder_path>
2. drag n drop the <second_folder_path> onto the script (or use commandline)
3. the sript will compare all files in both folders by crc and remove all file duplicates in <first_folder_path>

as result only the files wich dont have crc duplicates in <second_folder_path> stay in <first_folder_path>.
for softlink creation i use this: https://schinagl.priv.at/nt/hardlinkshe ... nsion.html

its maybe not the most convenient solution yet, but i find it quite usable as first shot...
i put the script+folder stucture as attachment.

[NotNull]

@klarah:

It is possible in Everything itself too (tested), but that requires a fix in Everything and that fix likely comes with the next update.
Will post the all the details when that fix is ready.

[Celestial92]

I’m still interested in what the next update to 1.5 can do, but I found a nice workaround which involves a few steps.

1a. find the distinct files in folder A, based on hash
e.g.

Code: Select all

"C:\folder A" distinct:MD5

1b. save the search results as a .efu file. e.g. folderA_distinct.efu

2a. find distinct files in folder B, based on hash
e.g.

Code: Select all

"C:\folder B" distinct:MD5

2b. save the search results as a .efu file. e.g. folderB_distinct.efu

3. combine the results of both .efu files into 1 efu file (e.g. FolderA+B_distinct.efu), through copy and pasting them together in notepad

4. open FolderA+B_distinct.efu file and find all the unique results, using

Code: Select all

unique:MD5

This all seems to work quite well so far, and using the efu files means I don’t have to recalculate the hashes for directories that don’t change.

[NotNull]

There is a bug in the distinct: function that causes the first file to be left out if multiple criteria are specified (i.e. distinct:name;md5)
That is planned to be fixed in the next update.
link

Your workaround -- using a single criterion -- is not affected by that bug.

[NotNull]

Try the following:

• Create a new Filter:

  Code: Select all

  Name =HashDiff (or anything you like)
  Search = file:   regex:([regex-escape:[element:$param:,;,1]])(.*$) | regex:([regex-escape:[element:$param:,;,2]])(.*$)      distinct:regmatch1;size;md5   unique:size;md5
  Macro = hashdiff

• Back in the main Everything window, set the active filter to Everything
• Search for:

  Code: Select all

  hashdiff:"c:\the first\folder\";"c:\another folder\"

  (don't forget the backslashes at the end of the foldernames)
• Let Everything calculate all MD5 hashes (which might take a while when not indexed)
  Progress will be shown in the statusbar
• Check the results.
• Report back

This will report:
- Files in "c:\the first\folder\" that do not exist anywhere in "c:\another folder\", based on MD5-hash and size.
- Files in "c:\another folder\" that do not exist anywhere in "c:\the first\folder\", based on MD5-hash and size.

These folders do not need to have the same folderstructure.


Some remarks:
- requires Everything 1.5.0.1372a or later
- you can replace MD5 with any other supported hash in the search query. MD5 was just less typing than CRC64
- Did not have much time to test, so consider this a beta version.
- Size is not strictly needed, but as collisions (2 different files having the same hash value) can theoretically happen, the chance that 2 colliding files *also* have the same size is very, very neglectible.

[Specular]

Try the following:

Thanks for this. Had to perform a checksum only comparison between two directories the other day, prior to discovering this, so instead had to use a different, more convoluted method via Powershell.