Handling command line flags in C/C++

Question

I am looking for a very simple explanation/tutorial on what flags are. I understand that flags work indicate a command what to do. For example:

rm -Rf test
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Answer 1

Actually you can write your own C++ programm which accepts commandline parameters like this:

int main(int argc, char* argv[]){}

The variable argc will contain the number of parameters, while the char* will contain the parameters itself.

You can dispatch the parameters like this:

for (int i = 1; i < argc; i++)
{  
    if (i + 1 != argc)
    {
        if (strcmp(argv[i], "-filename") == 0) // This is your parameter name
        {                 
            char* filename = argv[i + 1];    // The next value in the array is your value
            i++;    // Move to the next flag
        }
    }
}