pipeline - 为什么管道内容到命令 nc 不起作用？

Question

我尝试使用nc从shell获取zookeeper统计信息，

首先调用nc localhost 2181，然后输入:stat有效。

而回显“stat” | nc localhost 2181 什么也不返回。

为什么？

Answer 1

在 Zookeeper 邮件列表中问了同样的问题，得到了这个:

Most probably you are using the wrong "nc" command.

Not kidding :P there are two different "nc" packages, and the syntax is different betweem then. In debian-like distros they are netcat-openbsd and netcat-traditional, but I ran into the same problems with netcat in CentOS (I can't remember the name of the packages, sorry) until I realized I was using it wrong.

--Tomas Nunez

我发现我的服务器上的nc是nc.openbsd，安装nc.traditional后，

回显“stat”| nc.传统 10.18.10.30 2181

返回预期结果。