Problem:
How one can clean the ‘dot underbar‘ files or ‘Apple double‘ files?
Solution:
1) Open up the terminal application and enter the following command to merge & delete the files:
$ dot_clean -m DIRECTORY_ADDRESS

DIRECTORY_ADDRESS is the address of the folder or the directory that you want to clean the  ._ files.
If you want to delete all ._ files in your MAC just replace it with ‘./’.
2) or you can delete the files by entering the following command in the terminal:
$ find DIRECTORY_ADDRESS -name ._\* -delete

Tags: delete ._ files, Mac OS X