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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