tail_cp

tail_cp.cpp

#include <fstream>
#include <iterator>
#include <algorithm>
#include <cstdlib>

int main(int argc, char *argv[])
{
        std::ifstream in(argv[1], std::ios::ate);
        std::ofstream out(argv[2]);

        in.seekg(-std::min(static_cast<std::ios::pos_type>(std::atoi(argv[3])), in.tellg()), std::ios::end);

        std::copy(
                std::istreambuf_iterator<char>(in),
                std::istreambuf_iterator<char>(),
                std::ostreambuf_iterator<char>(out));
        return 0;
}