Bash 测试中的复合条件组
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Groups of compound conditions in Bash test
提问by d3pd
I want to have some groups of conditions in a Bash if statement. Specifically, I'm looking for something like the following:
我想在 Bash if 语句中包含一些条件组。具体来说，我正在寻找如下内容：
if <myCondition1 and myCondition2> or <myCondition3 and myCondition4> then...
How may I group the conditions together in the way I describe for use with one if statement in Bash? I thank you for any ideas you may have on this.
我如何按照我描述的方式将条件组合在一起，以便与 Bash 中的一个 if 语句一起使用？我感谢您对此的任何想法。
回答by William
Use the && (and) and || (or) operators:
使用 && (and) 和 || （或）运营商：
if [[ expression ]] && [[ expression ]] || [[ expression ]] ; then
They can also be used within a single [[ ]]:
它们也可以在单个 [[ ]] 中使用：
if [[ expression && expression || expression ]] ; then
And, finally, you can group them to ensure order of evaluation:
最后，您可以将它们分组以确保评估顺序：
if [[ expression && ( expression || expression ) ]] ; then
