bash if -v flag
ToconfirmwhetheravariableissetornotinBashScripting,wecanuse-vvaror-z$var}optionsasanexpressionwiththecombinationof'if'conditional ...,2021年1月13日—Itchecksifthereisavariablenamed'not-empty'thatisset.Youshouldtestlikethis:#!/bin/bashVAR=not-empty...
Bash Check if Variable is Set
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ToconfirmwhetheravariableissetornotinBashScripting,wecanuse-vvaror-z$var}optionsasanexpressionwiththecombinationof'if'conditional ...
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