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#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
int main()
{

	// make two process which run same  program after this instruction
	pid_t p = fork();
	if(p<0){
		perror("fork fail");
		exit(1);
	}
	printf("Hello world!, process_id(pid) = %d \n",getpid());
	return 0;
}