Underscore is a command line program to replace spaces with underscores in all filenames in the directory it is called in. 


Directions:  Add Underscore to your PATH.  Navigate to the directory containing the files you want to rename and run Underscore


Notes: This program was tested with Ruby version 1.8.  Underscore is released under version 2 of the GPL (and only version 2).


Download:

cmd iconzip icon Underscore 1.1.0

ruby iconzip icon Underscore 1.1.0 source