---
name: "nodup"
section: "1"
platform: "linux"
package: "perforate"
version: "1.2-6"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/finddup"
---

# nodup(1)

Find identical files and do something with them

Part of [finddup(1)](/finddup/1.md).

## NAME

finddup - Find identical files and do something with them

## SYNOPSIS

### Usage:

-

  finddup \[options...\]

- **--man**

  the manpage

- **-h**, **--help**

  a short help

- **--version**

  the version (CVS) of the program

- **-n**, **--noaction**

  do just nothing, just print out (implies **-v**)

- **-v**, **--verbose**

  just what the name says

- **-q**, **--quiet**

  be quiet

- **-l**, **--link**

  link the identical files together

- **-o**, **--oldresult**

  Use the old output of this script

- **-i**, **--ignore-perms**

  Don't check that file owner and permissions match

- **-d**, **--dir**

  Define the dir to check (you may specify more than one)

## DESCRIPTION

**finddup** search the working directory and all files below on the same partition for duplicate files.

**finddup** can optional hardlink such files to save space.

Files size 0 will not be reported or hardlinked as this might give problemes later.

This is a complete rewrite of the  **finddup** in perl to handle several issues:

  \- Allow spaces and other characters in filenames

  \- be faster

  \- include nodup in same script

  \- Handle files that already have other hardlinks in the same tree

  \- Several improvements

If started as nodup or nodup.pl the script will act like started with options --link and --oldresult

## COPYRIGHT

Copyright (c) 2005 by Klaus Ethgen. All rights reserved.

## LICENSE

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

## AUTHOR

Klaus Ethgen \<Klaus@Ethgen.de\<gt\>

## HISTORY

$Log: finddup,v $ Revision 2.3  2005/02/06 18:57:42  klaus \* Make --oldresult faster by not calculating the md5sum again \* Fix a but that with --oldresult no links will be done cause the internal\
   datastructure \* Do handle errors in open for md5sum calculation

Revision 2.2  2005/02/06 12:21:02  klaus Little but important bug in link routine.

Revision 2.1  2005/02/05 18:43:11  klaus Just cosmetic

Revision 2.0  2005/02/05 18:41:20  klaus Completely new version