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Both methods can be used to clear a file's content, but they differ in implementation and details: 1. : > file.log Explanation: : is a shell built-in null command that does nothing. > is the output redirection operator that redirects the null command's "out...

If pod has no curl or nslookup, use getent instead. getent ahosts foobar.namespace.svc.cluster.local getent ahosts google.com

Centos echo -e "\n=== OS ===\n$(cat /etc/redhat-release)\n\n=== Kernel ===\n$(uname -r)\n\n=== CPU ===\n$(lscpu | grep --color=never -E 'Model name|CPU\\(s\\)|Socket')\n\n=== Memory ===\n$(free -h)\n\n=== Disk ===\n$(df -h)\n" echo -e "\n=== OS ===\n$(cat /e...

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...