What's $e??

It says:

[General]
   exclude folders[$e]=$HOME/FolderA/,$HOME/FolderB/

Is that `$e` a typo, is it supposed to be replaced with something, or do you really need to write a literal `$e` in square brackets, and if so why?? Phpfourfan (talk) 15:41, 22 April 2025 (UTC)