Rendition can be used in command line mode to perform rendering tasks. It supports a variety of command line options to control it's behaviour - the general usage is as follows:

rendition -input_file_name <mi file> [options]
 Optional parameters
  -?
  -accumulate
  -aperture <width>
  -aspect <ratio>
  -contrast <red> <green> <blue> [alpha]
  -draft <secs>
  -file_name <output file>
  -file_type <file type>
  -finalgather <on/off>
  -finalgather_accuracy <rays>
  -focal <length>
  -help
  -interactive
  -render <start> [end]
  -resolution <width> <height>
  -samples <min> <max>
  -skip
  -trace_depth <reflect> [refract] [sum]
  -window <left> <top> <right> <bottom>

For example, to render out an entire .mi file, use:

Rendition -input_file_name myScene.mi

To render all frames between frame 312 and 405, use:

Rendition -input_file_name myScene.mi -render 312 405

To render all frames starting at frame 312 until the end of the file, use:

Rendition -input_file_name myScene.mi -render 312

Please note that the first frame in the .mi file is frame 1 (not frame 0).