更新 'shell/shell变量提取赋值.md'

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iProbe 2023-08-12 16:13:50 +08:00
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|表达式|含义| |表达式|含义|
|${var:-aa}|若var为空或未设定, 返回aa, var值不变| |${var:-aa}|若var为空或未设定, 返回aa, var值不变|