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

int main(int argc, char *argv[]) {

  pid_t pid; 
  char c;

  if ((pid = fork()) < 0) {  // error occured
    fprintf(stderr, "Fork failed\n");
    return 1;
  } else if (pid == 0) {   // child process
    printf("in Child process, type a char to continue ...\n");
    scanf("%c", &c);
    execlp("/bin/ls", "ls", NULL);
  } else {   // parent process
    printf("in Parent process, waiting for Child process to complete ...\n");
    wait(NULL);
    printf("Child completed\n");
    printf("in Parent process, type a char to complete ...\n");
    scanf("%c", &c);
  }
  return 0;
}