bash variable substitution
ParameterSubstitution.Manipulatingand/orexpandingvariables.$parameter}.Sameas$parameter,i.e.,valueofthevariableparameter....#!/bin/bash#Check ...,2015年1月7日—Thisexpandsglobsiftheyoccurinthestring.You'dwanttouseset-ftopreventthat.Italsoactsliket...
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Commandsubstitutionallowstheoutputofacommandtoreplacethecommanditself.Bashperformstheexpansionbyexecutingcommandandreplacingthecommand ...
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