Which can destroy all your config.txt or similar in a flash. You have to be very careful, right?īlindly eliminating duplicates can wreck everything I think I have found in the past.īut that may have been because my duplicate elimination software was too simplistic – perhaps not checking file length, calling files ‘duplicates’ merely because they had the same name. But i also know from experience it is not a simple job fixing it. I’ve got big problems with duplicate files, I know. I won’t need any other sources for what I want to know, looks like. Enough there to keep me busy for the rest of my life. ![]() | Move-Item -Destination $targetDir -Force -Verbose | Out-GridView -Title "Select the file(s) to move to `"$targetDir`" directory." -PassThru ` Get-ChildItem -Path $srcDir -File -Recurse | Group -Property Length ` This is accomplished by the PowerShell commands below: $srcDir = "D:\ISO Files" In this way, the overall time of the command is significantly reduced. The trick is to only compute the hashes of files having the same length because we already know that files with different lengths can't be duplicates. Because the Length value is retrieved from the directory, no computation is required. You probably know the Length property of the Get-ChildItem PowerShell cmdlet. Find duplicate files based on length and hashĪ necessary condition for duplicate files is that their size must match, which means that files where the size does not match cannot be duplicates. In the next section, we further optimize this command. The command will therefore take ages to find duplicates when used against a directory with a large number of large files. ![]() The hash computation is a resource-intensive operation, and the aforementioned command computes it for each file, regardless of its size. It works well for a few small files, but you will run into trouble if the source directory contains many large files. For those reasons, this command is particularly well-suited for directories with few but big files, since in those cases avoiding a checksum call may be more important than avoiding repeated tree traversal.The command has one serious flaw, though. It pays for that with repeated find invocations, thus traversing the directory tree multiple times. Print all members of such runs of duplicates, with distinct runs separated by newlines.Ĭompared to the simpler command suggested by heemayl, this has the benefit that it will only checksum files which have another file of the same size. | uniq -w32 -all-repeated=separateįind lines which agree in their first 32 bytes (the checksum after that comes the file name). Sort by checksums, since uniq only considers consecutive lines. This time we allow passing multiple files to a single invocation of md5sum. | xargs -0 md5sumįor each of these null-separated names, compute the MD5 checksum of said file. Print all the matching file names, separated by null bytes instead of newlines so filenames which contain newlines are treated correctly. This is the command to run for each size: Find files in the current directory which match that size, given in characters ( c) or more precisely bytes. ![]() Look for duplicate consecutive rows and keep only those. Sorting in ascending order and comparing as strings not numbers should work just as well, though, so you may drop the -rn flags. Sort numerically ( -n), in reverse order ( -r). If you drop these arguments, it will print paths instead, breaking subsequent steps. find -not -empty -type fįind all non-empty files in the current directory or any of its subdirectories. In case you want to understand the original command, let's go though that step by step.
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