dot_clean

dot_clean is a command-line utility in macOS that is used to clean up the "._" files that are created when transferring files from a non-Mac file system (such as NTFS or FAT32) to a Mac file system (such as HFS+ or APFS). These files are hidden and contain metadata about the original file, such as icon positions, resource forks, and extended attributes. The dot_clean command removes these files, which can help to avoid clutter and potential compatibility issues.