gistfile1.c

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

int main() {
  pid_t pid = fork();
  if (pid == 0) {
    printf("I'm the child -- about to run ls -a -l\n");
    execlp("ls", "ls", "-a", "-l", (char*)NULL);
  } else {
    printf("I'm the parent -- about to run pwd\n");
    execlp("pwd", "pwd", (char*)NULL);
  }

  return 1;
}