-f 

Remove a file or a directory and its corresponding shadow file without allowing it to print an error message or prompt for confirmation when it fails to remove the specified file or directory. If the file does not have the "write" permission, the system prompts for confirmation before removing the files and directories unless you specify the -f option. If you specify the -f option, you automatically confirm the file's removal, and the system permanently deletes the file without further confirmation.

-i 

Remove a file or directory and its corresponding shadow file and prompt for confirmation before each removal. This option overrides the -f option

file

Specify the file to remove. 

-R 

Remove a directory or directories along with everything under them and their respective shadow files. 

dir...

Specify the directory to remove.