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...
How to Check if a Variable Exists in a Bash if Statement?
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Tocheckit,the“-v”flagisoptimal.However,ifyouwishtocheckifthevariablehasnoorzerovalue,the“-z”flagisrecommended.Bashprovidesawide ...
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