This document is primarily based on the excellent manual put together by Brad Whitlock of Lawrence Livermore in 2005. Several years afterwards, the content from that manual was converted to serve as online help for the command line interpreter itself. As new routines were added, this online help was updated. In 2010, Jakob van Bethlehem of the University of Groningen wrote a wonderful script to convert the online help to manual form. In 2011, Hank Childs of Lawrence Berkeley merged the descriptions from Brad Whitlock’s original manual with the function definitions produced by Jakob’s conversion of the online help. In 2018, Alister Maguire of Lawrence Livermore wrote a script for converting this manual to restructuredText format to be used with Sphinx. The result is this manual.