Cannot change directory using system() in C++

Question

As the title says, I cannot use "cd" in even a super simple C++ program. More accurately, I CAN use it (i.e. it compiles and doesn't throw any errors) but it carries on as if I haven't.

My code is as follows:

#include <iostream>
#include <cstdlib>

int main()
{
    system("cd");
    system("dir");

    system("cd C:\\Users\\Sajado");
    system("dir");

    return 0;
}

The output window returns the directory listing of the project directory both times. I have also tried using paths other folders, both higher and lower, and cd .. has no effect either.

I am using codeblocks if that helps. I'm no C++ or cmd expert by any means so I may be missing something very obvious. Anyone know why this might be misbehaving?

The `system()` calls are independent. You will get a new environment each time. To do what you want create a batch file and execute that from cmd.exe in a single `system()`. — drescherjm, Nov 20 '16 at 19:52

score 6 · Answer 1 · edited May 23 '17 at 10:32

6

As explained here, you need to do:

system("cd C:\\Users\\Sajado && dir");

Because

The changed directory only lasts for the duration of the system command. The command starts a separate program, which inherits its current directory from your program, but when that program exits its current directory dies with it.

edited May 23 '17 at 10:32

Community

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1

answered Nov 20 '16 at 19:54

jpo38

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Ah OK. Thanks for everyone's answers. Very helpful. – Sajado Nov 20 '16 at 21:06

score 0 · Answer 2 · answered Nov 20 '16 at 19:55

As commented @drescherjm pointed out, system calls are interpreted in isolation of each other so if you change the working directory in one it will not be reflected in a subsequent call.

You can do this: system("cd C:\\Users\\Sajado && dir"); or, better yet, use an argument to the dir command: system("dir C:\\Users\\Sajado");

Cannot change directory using system() in C++

2 Answers2