How to use shell to determine whether a file or directory exists in Linux

Judgment directory:

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

Video tutorial recommendation: linux video tutorial

Judgment file:

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

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