Get all elements but the first as a separate vector

I'm trying to write a basic command-line program in C++. While the rest of the code probably has problems galore, too, the one I'm facing now is this: I've split the inputted line into pieces, but I can't figure out how to get all but the first so I can pass it down the line as the list of arguments for the command.

If this was Ruby, I'd do something like this, where parts is the array of space-separated arguments for the command:

command = parts[0]
args = parts[1..-1]

where parts is the array of bits that were space-separated.

TL;DR: How can I get all but the first elements of a vector?

If using another type makes it easier, feel free to say as much -- I don't think I'll have that much trouble porting it over.

I've tried using a deque, but I don't want to modify parts, just get pieces of it. I've also searched around on this site, but all of the questions that turn up are either related but solved in a way that I can't use, starts of a really hacky workaround that I'd rather avoid, or totally unrelated.

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^{P.S. I'm not using namespace std, but std:: is a pain to type so I omitted it here. Please do provide it in your answers, where applicable.}

^{P.P.S. I'm just (re)starting at C++ so please provide an explanation along with your answer.}