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code-praefect-86dc6b4f4f-ns6dj:~/code/code-gitaly# nc -zv code-gitaly-0-0 9999 code-gitaly-0-0 (10.1.244.170:9999) open nc -zv code-gitaly-0-0 9999 用的是 nc（即 netcat）命令，常用于端口探测或测试连接，参数含义如下： z：只扫描端口，不发送数据（"zero-I/O mode"）。 v：verbose，显示详细输出。 code-gitaly-0-0：目标主...

TCP/IP pseudo-files are a special feature in Bash that allow you to open network connections using file-like syntax. They're not real files in the /dev directory — rather, Bash internally interprets paths like /dev/tcp/host/port and /dev/udp/host/port to creat...