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| == Find and Remove Duplicate Files ==
| | [[Kategorie:Linux/Datei]] |
| Whether you’re using Linux on your desktop or a server, there are good tools that will scan your system for duplicate files and help you remove them to [https://www.howtogeek.com/185173/4-ways-to-free-up-disk-space-on-linux/ free up space].
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| * Solid graphical and command-line interfaces are both available.
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| Duplicate files are an unnecessary waste of disk space.
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| * After all, if you really need the same file in two different locations you could always set up a symbolic link or hard link, storing the data in only one location on disk.
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| === FSlint ===
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| FSlint is available in various Linux distributions’ software repositories, including Ubuntu, Debian, Fedora, and Red Hat.
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| * Just fire up your package manager and install the “fslint” package.
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| * This utility provides a convenient graphical interface by default, but it also includes command-line versions of its various functions.
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| * Like many Linux applications, the FSlint graphical interface is just a front-end that uses the FSlint commands underneath.
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| Don’t let that scare you away from using FSlint’s convenient graphical interface, though.
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| * By default, it opens with the Duplicates pane selected and your home directory as the default search path.
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| * All you have to do is click the Find button and FSlint will find a list of duplicate files in directories under your home folder.
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| * Use the buttons to delete any files you want to remove, and double-click them to preview them.
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| Note that the command-line utilities aren’t in your path by default, so you can’t run them like typical commands.
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| * On Ubuntu, you’ll find them under /usr/share/fslint/fslint.
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| * So, if you wanted to run the entire fslint scan on a single directory, here are the commands you’d run on Ubuntu:
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| <syntaxhighlight lang="bash" highlight="1" line>
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| cd /usr/share/fslint/fslint
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| ./fslint /path/to/directory
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| </syntaxhighlight>
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| This command won’t actually delete anything.
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| * It will just print a list of duplicate files — you’re on your own for the rest.
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| === fdupes ===
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| The fdupes command isn’t usually installed by default, but it’s available in many Linux distribution’s repositories.
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| * It’s a simple command-line tool.
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| * This is probably the most convenient, quickest tool you can use if you want to find duplicate files in an environment where you only have access to a Linux command line, not a graphical user interface.
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| Using it is simple.
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| * Just run the fdupes command followed by the path to a directory.
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| * So, '''fdupes /home/chris''' would list all duplicate files in the directory /home/chris — but not in subdirectories! The''' fdupes -r /home/chris''' command would recursively search all subdirectories inside /home/chris for duplicate files and list them.
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| This tool won’t automatically remove anything, it will just show you a list of duplicate files.
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| * You can then delete the duplicate files by hand, if you like.
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| * You can also run the command with the -d switch to have it help you delete files.
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| * You’ll be prompted to choose the files you want to preserve.
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| [[Image:Bild3.png|top]]
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| === dupeGuru, [http://www.hardcoded.net/dupeguru_me/ dupeGuru Music Edition], and [http://www.hardcoded.net/dupeguru_pe/ dupeGuru Pictures Edition] ===
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| '''RELATED:''' [https://www.howtogeek.com/142414/how-to-install-software-from-outside-ubuntus-software-repositories/ How to Install Software From Outside Ubuntu's Software Repositories]
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| Yes, we’re going to recommend dupeGuru once again.
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| * It’s an open-source and cross-platform tool that’s so useful we’ve already recommended it for [https://www.howtogeek.com/200962/how-to-find-and-remove-duplicate-files-on-windows/ finding duplicate files on Windows] and [https://www.howtogeek.com/201007/how-to-find-and-remove-duplicate-files-on-mac-os-x/ cleaning up duplicate files on a Mac].
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| dupeGuru is a bit less convenient because it’s not available in most Linux distributions’ software repositories — although it is available in Arch Linux’s repositories.
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| * However, the dupeGuru website offers [https://www.howtogeek.com/142414/how-to-install-software-from-outside-ubuntus-software-repositories/ a PPA] that lets you easily install their software packages on Ubuntu and Ubuntu-based Linux distributions.
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| * Users of other Linux distributions could even [https://www.howtogeek.com/105413/how-to-compile-and-install-from-source-on-ubuntu/ compile it from source].
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| As on Windows and Mac, dupeGuru offers three different editions — a standard edition for basic duplicate-file-scanning, an edition designed for finding duplicate songs that may have been ripped or encoded differently, and an edition intended for finding similar photos that have been rotated, resized, or otherwise modified.
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| * You can get them all from the dupeGuru website, and all three are available in the Ubuntu PPA.
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| This application works just as it does on other platforms.
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| * Launch it, add one or more folders to scan, and click Scan.
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| * You’ll see a list of duplicate files, and you can check them off and remove them — or move them to other platforms.
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| * You can also easily open and examine the file with a double-click.
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| After installation, the Ubuntu package must be launched from a command line — for example, with the''' dupeguru_se''' command for the standard edition.
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| * There appears to be no desktop shortcut installed by default.
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| * This lack of system integration is the only reason we can’t recommend this utility more highly, as it works well once you get it installed and launched.
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| [[Image:Bild4.png|top]]
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| As you might expect, this isn’t a complete list.
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| * You’ll find many other duplicate-file-finding utilities — mostly commands without a graphical interface — in your Linux distribution’s package manager.
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| * Unless you have specific needs, the above tools are our favorites and the ones we recommend.
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| == How To Find And Delete Duplicate Files In Linux ==
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| I always backup the configuration files or any old files to somewhere in my hard disk before edit or modify them, so I can restore them from the backup if I accidentally did something wrong.
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| * But the problem is I forgot to clean up those files and my hard disk is filled with a lot of duplicate files after a certain period of time.
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| * I feel either too lazy to clean the old files or afraid that I may delete an important files.
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| * If you’re anything like me and overwhelming with multiple copies of same files in different backup directories, you can find and delete duplicate files using the tools given below in Unix-like operating systems.
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| ; A word of caution
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| Please be careful while deleting duplicate files.
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| * If you’re not careful, it will lead you to [https://www.ostechnix.com/prevent-files-folders-accidental-deletion-modification-linux/ accidental data loss].
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| * I advice you to pay extra attention while using these tools.
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| === Find And Delete Duplicate Files In Linux ===
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| For the purpose of this guide, I am going to discuss three utilities namely
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| # Rdfind
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| # Fdupes
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| # FSlint
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| These three utilities are free, open source and works on most Unix-like operating systems.
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| ===== Rdfind =====
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| '''Rdfind''', stands for '''r'''edundant '''d'''ata '''find''', is a free and open source utility to find duplicate files across and/or within directories and sub-directories.
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| * It compares files based on their content, not on their file names.
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| * Rdfind uses '''ranking''' algorithm to classify original and duplicate files.
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| * If you have two or more equal files, Rdfind is smart enough to find which is original file, and consider the rest of the files as duplicates.
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| * Once it found the duplicates, it will report them to you.
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| * You can decide to either delete them or replace them with [https://www.ostechnix.com/explaining-soft-link-and-hard-link-in-linux-with-examples/ hard links or symbolic (soft) links].
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| ; Installing Rdfind
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| Rdfind is available in [https://aur.archlinux.org/packages/rdfind/ AUR].
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| * So, you can install it in Arch-based systems using any AUR helper program like [https://www.ostechnix.com/yay-found-yet-another-reliable-aur-helper/ Yay] as shown below.
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| <syntaxhighlight lang="bash" highlight="1" line>
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| sudo apt-get install rdfind
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| </syntaxhighlight>
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| ; Usage
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| Once installed, simply run Rdfind command along with the directory path to scan for the duplicate files.
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| <syntaxhighlight lang="bash" highlight="1" line>
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| $ rdfind ~/Downloads
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| </syntaxhighlight>
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| Rdfind command will scan ~/Downloads directory and save the results in a file named '''results.txt''' in the current working directory.
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| * You can view the name of the possible duplicate files in results.txt file.
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| <syntaxhighlight lang="bash" highlight="1" line>
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| cat results.txt
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| # Automatically generated
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| # duptype id depth size device inode priority name
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| DUPTYPE_FIRST_OCCURRENCE 1469 8 9 2050 15864884 1 /home/sk/Downloads/tor-browser_en-US/Browser/TorBrowser/Tor/PluggableTransports/fte/tests/dfas/test5.regex
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| DUPTYPE_WITHIN_SAME_TREE -1469 8 9 2050 15864886 1 /home/sk/Downloads/tor-browser_en-US/Browser/TorBrowser/Tor/PluggableTransports/fte/tests/dfas/test6.regex
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| [...]
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| DUPTYPE_FIRST_OCCURRENCE 13 0 403635 2050 15740257 1 /home/sk/Downloads/Hyperledger(1).pdf
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| DUPTYPE_WITHIN_SAME_TREE -13 0 403635 2050 15741071 1 /home/sk/Downloads/Hyperledger.pdf
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| # end of file
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| </syntaxhighlight>
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| By reviewing the results.txt file, you can easily find the duplicates.
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| * You can remove the duplicates manually if you like.
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| Also, you can '''-dryrun''' option to find all duplicates in a given directory without changing anything and output the summary in your Terminal:
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| <syntaxhighlight lang="bash" highlight="1" line>
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| rdfind -dryrun true ~/Downloads
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| </syntaxhighlight>
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| Once you found the duplicates, you can replace them with either hardlinks or symlinks.
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| To replace all duplicates with hardlinks, run:
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| $ rdfind -makehardlinks true ~/Downloads
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| To replace all duplicates with symlinks/soft links, run:
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| $ rdfind -makesymlinks true ~/Downloads
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| You may have some empty files in a directory and want to ignore them.
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| * If so, use '''-ignoreempty''' option like below.
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| $ rdfind -ignoreempty true ~/Downloads
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| If you don’t want the old files anymore, just delete duplicate files instead of replacing them with hard or soft links.
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| To delete all duplicates, simply run:
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| $ rdfind -deleteduplicates true ~/Downloads
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| If you do not want to ignore empty files and delete them along with all duplicates, run:
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| $ rdfind -deleteduplicates true -ignoreempty false ~/Downloads
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| For more details, refer the help section:
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| $ rdfind --help
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| And, the manual pages:
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| $ man rdfind
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| '''Suggested read:'''* [https://www.ostechnix.com/remove-duplicate-files-android-duplicate-files-fixer/ Remove Duplicate Files From Your Android With Duplicate Files Fixer]
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| ===== Fdupes =====
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| '''Fdupes''' is yet another command line utility to identify and remove the duplicate files within specified directories and the sub-directories. It is free, open source utility written in '''C''' programming language.
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| * Fdupes identifies the duplicates by comparing file sizes, partial MD5 signatures, full MD5 signatures, and finally performing a byte-by-byte comparison for verification.
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| Similar to Rdfind utility, Fdupes comes with quite handful of options to perform operations, such as:* Recursively search duplicate files in directories and sub-directories
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| * Exclude empty files and hidden files from consideration
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| * Show the size of the duplicates
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| * Delete duplicates immediately as they encountered
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| * Exclude files with different owner/group or permission bits as duplicates
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| * And a lot more.
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| '''Installing Fdupes'''
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| Fdupes is available in the default repositories of most Linux distributions.
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| On Arch Linux and its variants like Antergos, Manjaro Linux, install it using Pacman like below.
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| $ sudo pacman -S fdupes
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| On Debian, Ubuntu, Linux Mint:
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| $ sudo apt-get install fdupes
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| On Fedora:
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| $ sudo dnf install fdupes
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| On RHEL, CentOS:
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| $ sudo yum install epel-release
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| $ sudo yum install fdupes
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| '''Usage'''
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| Fdupes usage is pretty simple.
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| * Just run the following command to find out the duplicate files in a directory, for example '''~/Downloads'''.
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| $ fdupes ~/Downloads
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| Sample output from my system:
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| /home/sk/Downloads/Hyperledger.pdf
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| /home/sk/Downloads/Hyperledger(1).pdf
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| As you can see, I have a duplicate file in '''/home/sk/Downloads/''' directory.
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| * It shows the duplicates from the parent directory only.
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| * How to view the duplicates from sub-directories? Just use '''-r''' option like below.
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| $ fdupes -r ~/Downloads
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| Now you will see the duplicates from '''/home/sk/Downloads/''' directory and its sub-directories as well.
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| Fdupes can also be able to find duplicates from multiple directories at once.
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| $ fdupes ~/Downloads ~/Documents/ostechnix
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| You can even search multiple directories, one recursively like below:
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| $ fdupes ~/Downloads -r ~/Documents/ostechnix
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| The above commands searches for duplicates in “~/Downloads” directory and “~/Documents/ostechnix” directory and its sub-directories.
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| Sometimes, you might want to know the size of the duplicates in a directory.
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| * If so, use '''-S''' option like below.
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| '''$ fdupes -S ~/Downloads'''
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| 403635 bytes each:
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| /home/sk/Downloads/Hyperledger.pdf
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| /home/sk/Downloads/Hyperledger(1).pdf
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| Similarly, to view the size of the duplicates in parent and child directories, use '''-Sr''' option.
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| We can exclude empty and hidden files from consideration using '''-n''' and '''-A''' respectively.
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| $ fdupes -n ~/Downloads
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| $ fdupes -A ~/Downloads
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| The first command will exclude zero-length files from consideration and the latter will exclude hidden files from consideration while searching for duplicates in the specified directory.
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| To summarize duplicate files information, use '''-m''' option.
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| $ fdupes -m ~/Downloads
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| 1 duplicate files (in 1 sets), occupying 403.6 kilobytes
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| To delete all duplicates, use '''-d''' option.
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| $ fdupes -d ~/Downloads
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| Sample output:
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| [1] /home/sk/Downloads/Hyperledger Fabric Installation.pdf
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| [2] /home/sk/Downloads/Hyperledger Fabric Installation(1).pdf
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| Set 1 of 1, preserve files [1 - 2, all]:
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| This command will prompt you for files to preserve and delete all other duplicates.
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| * Just enter any number to preserve the corresponding file and delete the remaining files.
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| * Pay more attention while using this option.
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| * You might delete original files if you’re not be careful.
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| If you want to preserve the first file in each set of duplicates and delete the others without prompting each time, use '''-dN''' option (not recommended).
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| $ fdupes -dN ~/Downloads
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| To delete duplicates as they are encountered, use '''-I''' flag.
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| $ fdupes -I ~/Downloads
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| For more details about Fdupes, view the help section and man pages.
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| $ fdupes --help
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| $ man fdupes
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| '''Also read:'''* [https://www.ostechnix.com/duplicate-photos-fixer-organize-photo-library-well/ Duplicate Photos Fixer: Organize Your Photo Library Well]
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| ===== FSlint =====
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| '''FSlint''' is yet another duplicate file finder utility that I use from time to time to get rid of the unnecessary duplicate files and free up the disk space in my Linux system.
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| * Unlike the other two utilities, FSlint has both GUI and CLI modes.
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| * So, it is more user-friendly tool for newbies.
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| * FSlint not just finds the duplicates, but also bad symlinks, bad names, temp files, bad IDS, empty directories, and non stripped binaries etc.
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| '''Installing FSlint'''
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| FSlint is available in [https://aur.archlinux.org/packages/fslint/ AUR], so you can install it using any AUR helpers.
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| $ yay -S fslint
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| On Debian, Ubuntu, Linux Mint:
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| $ sudo apt-get install fslint
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| On Fedora:
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| $ sudo dnf install fslint
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| On RHEL, CentOS:
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| $ sudo yum install epel-release
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| $ sudo yum install fslint
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| Once it is installed, launch it from menu or application launcher.
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| This is how FSlint GUI looks like.
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| [[Image:Bild6.png|top]]
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| FSlint interface
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| As you can see, the interface of FSlint is user-friendly and self-explanatory.
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| * In the '''Search path''' tab, add the path of the directory you want to scan and click '''Find''' button on the lower left corner to find the duplicates.
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| * Check the recurse option to recursively search for duplicates in directories and sub-directories.
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| * The FSlint will quickly scan the given directory and list out them.
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| [[Image:Bild8.png|top]]fslint GUI
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| From the list, choose the duplicates you want to clean and select any one of them given actions like Save, Delete, Merge and Symlink.
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| In the '''Advanced search parameters''' tab, you can specify the paths to exclude while searching for duplicates.
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| [[Image:Bild7.png|top]]
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| fslint advanced search
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| '''FSlint command line options'''
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| FSlint provides a collection of the following CLI utilities to find duplicates in your filesystem:* '''findup''' — find DUPlicate files
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| * '''findnl''' — find Name Lint (problems with filenames)
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| * '''findu8''' — find filenames with invalid utf8 encoding
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| * '''findbl''' — find Bad Links (various problems with symlinks)
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| * '''findsn''' — find Same Name (problems with clashing names)
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| * '''finded''' — find Empty Directories
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| * '''findid''' — find files with dead user IDs
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| * '''findns''' — find Non Stripped executables
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| * '''findrs''' — find Redundant Whitespace in files
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| * '''findtf''' — find Temporary Files
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| * '''findul''' — find possibly Unused Libraries
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| * '''zipdir''' — Reclaim wasted space in ext2 directory entries
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| All of these utilities are available under '''/usr/share/fslint/fslint/fslint''' location.
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| For example, to find duplicates in a given directory, do:
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| $ /usr/share/fslint/fslint/findup ~/Downloads/
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| Similarly, to find empty directories, the command would be:
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| $ /usr/share/fslint/fslint/finded ~/Downloads/
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| To get more details on each utility, for example '''findup''', run:
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| $ /usr/share/fslint/fslint/findup --help
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| For more details about FSlint, refer the help section and man pages.
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| $ /usr/share/fslint/fslint/fslint --help
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| $ man fslint
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| ; Resources
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| * [https://rdfind.pauldreik.se/ Rdfind Website]
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| * [https://github.com/pauldreik/rdfind Rdfind GitHub Repository]
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| * [https://github.com/adrianlopezroche/fdupes Fdupes GitHub Repository]
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| * [http://www.pixelbeat.org/fslint/ FSlint Website]
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| * [https://github.com/pixelb/fslint FSlint GitHub Repository]
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| == How to Find Duplicate Files in Linux and Remove Them ==
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| ''Brief: FSlint is a great GUI tool to find duplicate files in Linux and remove them.
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| * FDUPES also find the files with same name in Linux but in the command line way. ''
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| If you have this habit of downloading everything from the web like me, you will end up having multiple duplicate files.
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| * Most often, I can find the same songs or a bunch of images in different directories or end up backing up some files at two different places.
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| * It’s a pain locating these duplicate files manually and deleting them to recover the disk space.
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| If you want to save yourself from this pain, there are various Linux applications that will help you in locating these duplicate files and removing them.
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| * In this article, we will cover how you can find and remove these files in Ubuntu.
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| ''Note: You should know what you are doing.
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| * If you are using a new tool, it’s always better to try it in a virtual directory structure to figure out what it does before taking it to root or home folder.
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| * Also, '''it’s always better to [https://itsfoss.com/backup-restore-linux-timeshift/ backup your Linux system]!'''''
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| === FSlint: GUI tool to find and remove duplicate files ===
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| FSlint helps you search and remove duplicate files, empty directories or files with incorrect names.
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| * It has a command-line as well as GUI mode with a set of tools to perform a variety of tasks.
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| To install FSlint, type the below command in Terminal.
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| sudo apt install fslint
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| Open FSlint from the Dash search.
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| FSlint includes a number of options to choose from.
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| * There are options to find duplicate files, installed packages, bad names, name clashes, temp files, empty directories etc.
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| * Choose the Search Path and the task which you want to perform from the left panel and click on Find to locate the files.
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| * Once done, you can select the files you want to remove and Delete it.
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| You can click on any file directory from the search result to open it if you are not sure and want to double check it before deleting it.
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| You can select '''Advanced search parameters''' where you can define rules to exclude certain file types or exclude directories which you don’t want to search.
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| === FDUPES: CLI tool to find and remove duplicate files ===
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| FDUPES is a command line utility to find and remove duplicate files in Linux.
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| * It can list out the duplicate files in a particular folder or recursively within a folder.
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| * It asks which file to preserve before deletion and the noprompt option lets you delete all the duplicate files keeping the first one without asking you.
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| ==== Installation on Debian / Ubuntu ====
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| sudo apt install fdupes
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| ==== Installation on Fedora ====
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| dnf install fdupes
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| Once installed, you can search duplicate files using the below command:
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| fdupes /path/to/folder
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| For recursively searching within a folder, use -r option
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| fdupes -r /home
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| This will only list the duplicate files and do not delete them by itself.
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| * You can manually delete the duplicate files or use ''-d'' option to delete them.
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| fdupes -d /path/to/folder
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| This won’t delete anything on its own but will display all the duplicate files and gives you an option to either delete files one by one or select a range to delete it.
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| * If you want to delete all files without asking and preserving the first one, you can use the noprompt ''-N'' option.
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| In the above screenshot, you can see the ''-d'' command showing all the duplicate files within the folder and asking you to select the file which you want to preserve.
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| ==== Final Words ====
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| There are many other ways and tools to find and delete duplicate files in Linux.
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| * Personally, I prefer the FDUPES command line tool; it’s simple and takes no resources.
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| How do you deal with the finding and removing duplicate files in your Linux system? Do tell us in the comment section.
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| === Quellen ===
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| * [https://itsfoss.com/find-duplicate-files-linux/ https://itsfoss.com/find-duplicate-files-linux/]
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| * [https://www.howtogeek.com/201140/how-to-find-and-remove-duplicate-files-on-linux/ https://www.howtogeek.com/201140/how-to-find-and-remove-duplicate-files-on-linux/]
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| * [https://www.ostechnix.com/how-to-find-and-delete-duplicate-files-in-linux/ https://www.ostechnix.com/how-to-find-and-delete-duplicate-files-in-linux/]
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