I do not know which one is the best method, but, one that is easy is:
STRTOFILE(lcExpresion, lcFile, 1) && The one is for additive
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges