So I am trying to write format expressions for use through the CLI and I am confused by the $ that I see sometimes. I cannot tell when to use it or why. Some examples show things like
{ [$vf]}
See here http://filebot.sourceforge.net/forums/v ... 5&t=2#p783
and then there are other time when there isn't a $
{ac}
See here the last one before Okam posts http://filebot.sourceforge.net/forums/v ... =5&t=2#p51
Could you help me understand when I should use it and when I shouldn't? I cannot figure it out from the examples

Thanks again
-S