julien@ubuntu:~/c/shell$ cat fork.c

#include <stdio.h>

#include <unistd.h>

​

/**

 * main - fork example

 *

 * Return: Always 0.

 */

int main(void)

{

    pid_t my_pid;

    pid_t pid;

​

    printf("Before fork\n");

    pid = fork();

    if (pid == -1)

    {

        perror("Error:");

        return (1);

    }

    printf("After fork\n");

    my_pid = getpid();

    printf("My pid is %u\n", my_pid);

    return (0);

}

julien@ubuntu:~/c/shell$ ./fork 

Before fork

After fork

My pid is 4819

julien@ubuntu:~/c/shell$ After fork

My pid is 4820