The document discusses using the command line interface in Weka. It describes how to run the J48 classifier on an ARFF file from the command line using "java weka.classifiers.trees.J48 -t weather.arff". It also explains Weka's package hierarchy and how the JVM creates instances of classifiers by allocating memory when executing them from the command line. Finally, it mentions that command line options can display the applicable options for a given scheme, including general and scheme-specific options.