- First argument to get (zero is normally the program itself)
- Last argument to get (or minus one for all arguments after n)
- String to use to separate arguments when more than one.
Returns arguments from the current process starting with argument number n, up to argument m. If there are less than n arguments, or the arguments cannot be retrieved from the current process, the empty string is returned. If m is smaller than n then all arguments starting from argument n are returned. Argument zero is traditionally the command itself.