The following command will list all duplicate lines in .dic dictionary files for the spelling checker: for i in $(find . -name '*.dic' -type f); do echo -n $i\ ; sort $i|uniq -c|grep -v ' 1 '; done Please deduplicate the lines for the dictionaries maintained here and if possible report upstream author. Note that changes to .dic files need an update of the first line of the .dic file in which the number of words in that dictionary is listed. Some dictionaries have hundreds of duplicate lines. Improving dictionaries will (marginally) increase dictionary load times and improve dictionary maintainability.
Pander, do you want do it yourself?
No, and giving this a second thought, you can close it. In the end, duplicates are there sometimes for a reason, because the file has been authored or generated like that.