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更新 'shell/shell变量提取赋值.md'

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iProbe 2023-08-12 16:15:50 +08:00
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shell/shell变量提取赋值.md
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@ -1,5 +1,5 @@
|-|-|
|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=aa|
|${var:+aa}|若var有值 返回aa, var值不变|