-f

Use this command without allowing it to print error messages, even when the operation fails to change the mode. 

-i

Prompt for confirmation before the mode changes. 

-R

Change the mode of a directory and all files or directories under that directory, and change the shadow file information for the files and directories. 

absolute-mode

Specify a four-digit octal mode. 

file

Specify a file. 

dir

Specify a directory. 

symbolic-mode-list

Specify a list of symbolic expressions in the following form, where who represents the characters u, g, o, and/or a; operator specifies the way you want permissions to change, with +, -, or =; and permissions represents any compatible combination of r, w, x, l, s, and t: 

[who] operator [permissions]