How to determine whether a file or directory exists through an if statement in Linux

Directory judgment:

path="/home" #if [ ! -d ${path} ];then if [ -d ${path} ];then echo dir ${path} exist! else echo dir ${path} not exist! fi

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File judgment:

file="/home/log.txt" if [ -f ${file} ];then echo file ${file} exist! else echo file ${file} not exist! fi

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