As this parameter consumes space in the tagged string area of NVRAM, you should keep the filename as short as possible. The tagged string area is described in Chapter 11, Boot Monitor and NVRAM.
 
Table 6-6  config-unix-directory Parameter  
  Possible Values
  Results
default
 
The terminal searches the /usr/lib/X11/ncd/configs directory for configuration files.
 
pathname
 
The terminal searches the specified directory for configuration files.
 
The directory must be world-readable and can be world-writable.