PHP 5.1.2+ is required.

$ sudo apt-get install php5 # If PHP is not already installed, of course.

Usage

Basic usage is very easy:

$ watch-less /path/to/less/files /path/to/css/output

You can also specify the output extension (default ".css"):

$ watch-less /path/to/less/files /path/to/css/output .less.css

Note that this script is recursive and create directories if needed.

Enjoy :)