CTF scripting

[clearwa]

Is there a reference for the script language used for the CTF facility?  Can't find it if it exists - otherwise offering an editor without a reference is a little problematic.  In particular, I want to enter keyword substitution strings for SVN in the header of any file generated by C++ file template.  These have the form $<keyword>$; I only see $$ in the generated code.  Clearly the $ sign has some special interpretation - it needs to be escaped - but I can't see how to do it - is it being interpreted as an environment variable - HELP!!

Thanx in advance,
Allan Clearwaters