[R] Execute a list of R instructions from a file

[pau carre]

Hello, I want to do the following: First, generate an R code in a file
from an external program, then send the name of the file to R using
sockets, finally let R to open that file and to execute the R code.
I just wanted to know if there is any function in R that reads a file
an executes the R code inside it.

Something like:
file.txt:
state <- c("tas", "sa",  "qld", "nsw", "nsw", "nt",  "wa",  "wa", "qld", "vic")

R execution:
>readAndExecute(file.txt)

Thanks
Pau.