.clang-format customization

Hi all,

I was trying to customize clang-format style. I generated a. clang-format style by using: clang-format -style=llvm -dump-config > .clang-format. Then i modified this .clang-format as required. The command line i have used is clang-format -style=file -i. It doesn’t execute this customization .clang-format. Any documentation or how to run this config styles.?

Thanks.