Beginner's question: How to redirect shell's standard output into program's stream?

Hi, this is a beginners question, I appreciate you taking the time to help me out.

The motivation:
I want to take the standard output of a shell command (in Red Hat, using tcsh, in my case) and redirect it into my program for processing.

(Then ideally I would love to take the output of my program and redirect it to yet another command, but this is a second issue.)

Simple example:
I naively thought this might work:

I want to type this on the shell:

Code:

---

$ echo Harry > hello

---

and I was expecting this output on my terminal:

Code:

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$ hello, Harry

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And this would be my simple hello program:

Code:

---

#include <iostream>
#include <string>

int main() {
  std::string usrInput;
  std::cin >> usrInput;
  std::cout << "hello, " << usrInput << std::endl;
  return 0;
}

---

Thank you very much for your help!

Code:

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echo Harry | hello

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Edit: http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-4.html

Thank you so much. Funny, I was sure I had tested both > and | . Will read more on those operators, thank you!

And for other begginers looking at this thread, check this out:

Code:

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echo Harry > hello

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will write "Harry" to the file hello (and that is when the hello file ceases to be the compiled program and becomes an ordinary text file ;-)