Case-insensitive search of duplicate file-names

case sensitivityduplicate filesfinduniq

I there a way to find all files in a directory with duplicate filenames, regardless of the casing (upper-case and/or lower-case)?

Best Answer

If you have GNU utilities (or at least a set that can deal with zero-terminated lines) available, another answer has a great method:

find . -maxdepth 1 -print0 | sort -z | uniq -diz

Note: the output will have zero-terminated strings; the tool you use to further process it should be able to handle that.

In the absence of tools that deal with zero-terminated lines, or if you want to make sure your code works in environments where such tools are not available, you need a small script:

#!/bin/sh
for f in *; do
  find . -maxdepth 1 -iname ./"$f" -exec echo \; | wc -l | while read count; do
    [ $count -gt 1 ] && echo $f
  done
done

What is this madness? See this answer for an explanation of the techniques that make this safe for crazy filenames.

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