How do I reference destination in icing?

[gotoplanb]

I’m trying to make an icing script. Assume I’m generating a file called html/third.html, I then want to copy to the clipboard. Easy enough from terminal using cat html/third.html | pbcopy

Trying to do this as icing, closest I can get is:

cmd: ['cat', `<%= destination %>"/"<%= filename %>`]

which barks at me that "destination is not defined"

1. How should I be referencing destination in an icing script?
2. Is it possible to chain commands in an icing script with either && or |?