This is t1-template.txt

With $(a) & ${b}:
include "t1-include.txt"

substitute "a=aaa,b=bbb"
On defining a=$(a) & b=${b}:
include "t1-include.txt"

substitute "a=\"aa\""
On setting a=$(a):
include "t1-include.txt"

End of t1-template.txt
