How to get main() function return value in Linux terminal.

Sometimes we want to get the exit value of main() function, using the "echo $? " can get the most recently program exit value.

Example program:

	#include <stdio.h>
	int main(void)
	{
	printf("Hello world\r\n");
	return 0xff;
	}

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Result:

Reference:
  1. UNIX Shell Programming