dupehasher Icon



Shell script for managing duplicate image files in a directory.

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dupehasher scans the given directory for files that are identical except by filename.
dupeshasher will generate a report plaintext file named 'dupelist.txt' in the working directory (which contains, per line, tab-delimited names of files whose contents are identical).

Depending upon the arguments supplied by the user upon invoking dupeshasher, it will also delete all duplicates, keeping either the oldest or newest of all sets of duplicates. Additionally it can batch-rename all remaining (post-deletion) files in a chronologically-sequential manner; or according to the md5sum or sha256 sum of every file.

File extensions (.jpg for example) are preserved, and there is a user option to ensure that the extension is correct (for example, a .jpg file is indeed a jpeg and not, for example, a png).

Finally, an interactive mode exists for users who are not comfortable with the command line.

dupehasher Web Site


  • Detect multiple copies of a file that are identical (based on md5sum)
  • Bulk-delete all but oldest copy for each set of identical files
  • Automatically fix file extension to match file type
  • Batch rename all files in directory sequentially
  • Batch rename all files in directory according to md5sum
  • Batch rename all files in directory according to sha256sum


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Additional Project Details

Intended Audience

Information Technology, Advanced End Users, System Administrators, End Users/Desktop, Other Audience

User Interface


Programming Language

Unix Shell



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