This library provides command-line arguments access and exit procedures.
[R6RS] Returns a nonempty list of strings. The first element is the running script file name or '() on REPL. The remaining elements are command-line arguments according to the operating system's conventions.
[R6RS] Exits the running program and communicates an exit value to the operating system. If no argument is supplied, the exit procedure should communicate to the operating system that the program exited normally. If an argument is supplied and if it is fixnum, the exit procedure translates it into an appropriate exit value for the operating system. Otherwise the exit is assumed to be abnormal.