A shell colon does nothing. Use it anyway

空冒号在 shell 中不起作用，但还是使用它

HN 125 分 · 42 条评论 · 作者 olexsmir · 来源 refp.se · HN 讨论

【摘要】

The article highlights the power of the shell colon in streamlining script logic, specifically replacing multiple lines of argument validation with a single construct. This technique utilizes parameter expansion to check if variables are set or empty, exiting with an error if they are not.

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