<span style="font-family: Arial, Helvetica, sans-serif;">//fork.c</span>

#include "sys/types.h"
#include "unistd.h"
#include "stdio.h"
#include "stdlib.h"

int main()
{
	pid_t result;
	result=fork();
	//报错处理
	if(result==-1)
	{
	  printf("Fork Error\n");
	}
	//son
	else if(result==0)
	{//调用execlp()函数，相当于"ps -ef"
	 if((result=execlp("ps","ps",NULL))<0);            
	      printf("son\n");
	}
	//father
        else 
	{
	 if((result=execlp("ls","ls",NULL))<0);   
              printf("father\n");
	}
} 

代码如上，执行后，显示ps及ls 的信息