Evaluates the shell (sh) code.
# S3 method for RspShSourceCode
evaluate(object, envir=parent.frame(), args="*", output=c("RspStringProduct", "stdout"),
  ..., verbose=FALSE)The environment in which the RSP string is evaluated.
A character string specifying how the RSP output
    should be handled/returned.
Optional arguments passed to eval().
If output="stdout", then NULL is returned and the RSP output
 is sent to the standard output.
 Note that this is output is "buffered", meaning it will be sent to
 standard output upon completion.  This is a limitation of R.
 If output="RspStringProduct", then the output is captured
 and returned as an RspStringProduct with attributes set.
For more information see RspShSourceCode.