#include <stdio.h>
#include <unistd.h>
int main(int argc, char *argv[])
{
    int pid;
    /* fork another process */
    pid = fork();
    if (pid < 0) { /* error occurred */
       fprintf(stderr, "Fork Failed");
       exit(-1);
    }
    else if (pid == 0) { /* child process */
       execlp("/bin/ls","ls",NULL);
    }
    else { /* parent process */
          /* parent will wait for the child to complete */
          wait(NULL);
          printf("Child Complete");
          exit(0);
    }
}