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Linux: How To Locate Duplicated Files Quickly

Locate duplicates quickly: I mean only size+filename check, not expensive MD5 sum computation:

find . -printf "%f:%s:%p\n" -type f | \
    awk -F: '
            key=$1 " " $2;
            loc[key]=loc[key] $3 " "
        END {
            for(key in occur) {
                if(occur[key]>1) {
                    print key ": " loc[key]
    ' | sort

A bit of explanation of above magic:

  • printf: tells find command to output file metadata instead of only file path (the default), this metadata (size, filename) will be used later
  • -F: :We want to handle properly paths with spaces, that's why special separator is used
  • key=$1 " " $2: we use file name (without dir) and file size to create ID for this file
  • occur: table (key -> number of file occurences)
  • loc: maps file ID to list of locations found
  • occur[key]>1: we want to show only files that have duplicates
  • sort: results are sorted alphabetically for easier navigation