#include <stdio.h>
#include <unistd.h>

int main()
{
	int id = fork();
	if (id < 0)
		printf("Fork failure\n");
	else if (id == 0)
		printf("Inside child: Pid of Parent Process: %d ::Pid of Child Process: %d\n\n", getppid(), getpid());
	else
		printf("Inside Parent: Pid of Parent Process: %d ::Pid of Child Process: %d\n\n", getpid(), id);
	return 0;
}

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(void){
	int i;
        uid_t id = geteuid();
	struct utsname whoami;
	i = uname(&whoami); /* hold the structure */
	if ( i == 0 ){
		printf("Operating system name : %s\n",whoami.whoami);
}