c++ and linux

[Garrett85]

I'M learning c++ but I'M doing so from a linux environment. I need to know how to receive command line arguments in C++. I know in bash you use $1, $2, $3, etc... . Thanks.

[mrbruno]

Since the ancient days of C, the command line arguments are passed through a couple magical variables available to main():

$ cat HelloWorld.cpp
#include <iostream>
using namespace std;

int main(int argc, char **argv) {
   for (int i=0; i<argc; i++)
      cout << i << ": " << argv[i] << "\n";
   return 0;
}
$ ./HelloWorld 'this is a' test
0: ./HelloWorld
1: this is a
2: test

I hope this helps. argv[0] is typically the name of your program - which is not as silly as it might sound. Using that, you can often figure out where your program lives or you can do different things depending on how it gets called.