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Shellvariablesareallowedasoperands;parameterexpansionisperformedbeforetheexpressionisevaluated.Withinanexpression,shellvariablesmayalsobe ...,2017年6月13日—Getstartedwiththisquickhow-toguideonexpansionmodifiersthattransformBashvariablesandotherpa...
Shell Parameter Expansion (Bash Reference Manual)
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Theexpansionisastringintheformofanassignmentstatementordeclarecommandthat,ifevaluated,willrecreateparameterwithitsattributesandvalue.
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