Shell command for finding equal files
|LTS Haskell 19.33:||0.0.5.3|
|Stackage Nightly 2023-03-27:||0.0.5.4|
|Latest on Hackage:||0.0.5.4|
Module documentation for 0.0.5.4
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Shell command that finds files with equal content in a given set of files. This is useful for finding duplicates in a set of documents where the same document might have been stored by accident with different names. Use it like
equal-files `find my_dir -type f`
find my_dir -type f | xargs equal-files
If the file names contain spaces, better use
find my_dir -type f -printf "'%p'\n" | xargs equal-files
equal_files -r my_dir
The program reads all input files simultaneously, driven by sorting and grouping of their content. However be prepared that due to the simultaneous access you may exceed the admissible number of opened files. Thus you may prefer to run it like
equal_files -r -p 512 my_dir
The program can be used as a nice example of a declarative yet efficient implementation of a non-trivial algorithm, that is enabled by lazy evaluation.