问HN：有什么今天被低估但实际上非常有用的技术技能？
我们常常谈论掌握流行的编程语言、框架和人工智能工具。但那些默默无闻却能让你效率提升十倍的技能呢？
例如：
- 知道如何编写自定义的 shell 脚本来替代某个 SaaS 工具
- 使用无代码工具、定时任务和 GitHub Actions 构建内部工具
- 理解如何逐行优化一个缓慢的 SQL 查询
- 编写一个 bash 一行代码，每周为你节省数小时
- 像使用超能力一样使用命令行
我很好奇：
你学到的那些被低估但极具价值的技术技能有哪些，更多人应该知道？
欢迎分享故事、例子，或者你所信赖的小众工具。如果是你偶然发现或出于必要而掌握的技能，而不是通过教程学到的，那就更棒了。
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We often talk about mastering popular languages, frameworks, and AI tools. But what about the less-hyped skills that quietly make you 10x more effective?<p>For example:<p>Knowing how to write a custom shell script that replaces a SaaS tool<p>Building internal tools with no-code + cron + GitHub Actions<p>Understanding how to optimize a slow SQL query line-by-line<p>Crafting a bash one-liner that saves you hours every week<p>Using the command line like a superpower<p>I'm curious:
What are the most underrated but highly valuable tech skills you've learned that more people should know about?<p>Would love to hear stories, examples, or even niche tools you swear by. Bonus points if it’s something you only discovered by accident or necessity, not through a tutorial.