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int main1(int argc ,char *argv[])
{
	
	if(argc < 2 ) return 0;
     int fd = open(argv[1] , O_RDONLY);
     if(fd == -1)
     {
    	 printf("error is %s\n" , strerror(errno));
     }
     else
     {
    	 printf("fd = %d\n" ,fd);
    	 char buf[100];
    	 memset(buf , 0, 100);
    	 while(read(fd, buf, sizeof(buf)) > 0)//文件大的时候由于buf太小每次只读buf大小
    	 {
    		  printf("%s\n" , buf);
    		  memset(buf , 0, 100);//读完以后清空buf
}
close(fd);
}
	return EXIT_SUCCESS;
}
int main(int argc ,char *argv[])
{
	char *s = {"abc.txt"};
	int fd = open(s, O_RDWR|O_APPEND);//以读写追加的方式
	if(fd == -1)
	{
		printf("error is %s\n" , strerror(errno));
	}
	else
	{
          	printf("sucess fd = %d\n" ,fd);
			char buf[100];
			memset(buf, 0,100);
			strcpy(buf,"hello world!\n");
			int i = write(fd, buf , strlen(buf));
	}
close(fd);
	return 0;
}
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原文地址:http://www.cnblogs.com/yuankaituo/p/4326505.html