bash set var if not set - Shell-Bash 代码示例

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📜 bash set var if not set - Shell-Bash 代码示例

📅 最后修改于: 2022-03-11 14:50:07.011000 🧑 作者: Mango

代码示例1

${parameter:-word}
    # If parameter is unset or null, the expansion of word is substituted. 
    # Otherwise, the value of parameter is substituted.