linux中如何通过if语句判断文件或目录是否存在

path="/home"

#if [ ! -d ${path} ];then

if [ -d ${path} ];then

    echo dir ${path} exist!

else

    echo dir ${path} not exist!

fi

file="/home/log.txt"

if [ -f ${file} ];then

    echo file ${file} exist!

else

    echo file ${file} not exist!

fi