一个进程预定义了三个流：标准输入、标准输出、标准出错。分别用文件描述符STDIN_FILENO、STDOUT_FILENO、STDERR_FILENO分别表示他们，用流指针stdin、stdout、stderr可以加以引用。-Process IO on the first day of learning

Edit the scr ipt and change on the first lines the url to the tvheadend server, username, password and network name. Then just call the scr ipt and it will output on stdout the twin2cs.channelinfo