rdfind
Find files with duplicate content and get rid of them. tldr-pages
On several platforms
Several platforms
Identify all duplicates in a given directory and output a summary
rdfind -dryrun true path/to/directoryIdentifyReplace all duplicates with hardlinks
rdfind -makehardlinks true path/to/directoryIdentifyReplace all duplicates with symlinks/soft links
rdfind -makesymlinks true path/to/directoryIdentifyDelete all duplicates and do not ignore empty files
rdfind -deleteduplicates true -ignoreempty false path/to/directoryIdentify