如何从BC++程序中更改BASH目录?

#include <iostream>
using std::cout;
using std::cin;

int main() {

    //SUB-ROUTINE: print directory paths with index, using "complex" algorithm
    //                (so an external command rather than a bash function)
    //                (this sub-routine gives choose-able options to a user)
    //                (please note this sub-routine includes `cout`)

    unsigned index;
    cout << "Input index: ";
    cin >> index;

    switch (index) {
        case 0:
            cout << "/home/user/foo"; break;
        case 1:
            cout << "/home/user/bar"; break;
        default:
            cout << "/home/user";
    }

}

cd $(a.out)

因为很多原因。一个原因是 a.out 具有比结果目录路径更多的输出。

bash )? Linux特定的方式是可以的。当然,尽管将目录路径输出到文件(在ramdisk中)并从bash读取它可以实现我想要的,但我认为这不是一个明智的方法。

Changing the directory of the shell through a C++ program

补充:

如果我重写C++程序

#include <iostream>
using std::cout;
using std::cin;

int main(int argc, char **argv) {

    if (argc == 1) {

        //print directory paths with index

    } else {

        unsigned index = atoi(argv[1]);

        switch (index) {
            case 0:
                cout << "/home/user/foo"; break;
            case 1:
                cout << "/home/user/bar"; break;
            default:
                cout << "/home/user";
        }

    }

}

,我就可以写了

./a.out
reply -p "Input index: "
cd $(a.out $REPLY)