is there an escape character for envsubst?

Question

Is there a way to prevent envsubst from substituting a $VARIABLE? For example, I would expect something like:

export THIS=THAT
echo         


        

Answer 1

In my case I wanted to only escape vars that aren't already defined. To do so run:

envsubst "$(env | sed -e 's/=.*//' -e 's/^/\$/g')"