isEmpty=$(hdfs dfs -count /some/path | awk '{print $2}')
if [[ $isEmpty -eq 0 ]];then
    echo "Given Path is empty"
    #Do some operation
else
    echo "Given Path is not empty"
    #Do some operation
fi

count :

hdfs dfs -count /path
           1            0                  0 /path

输出列为：
DIR_COUNT, FILE_COUNT, CONTENT_SIZE, PATHNAME du :

hdfs dfs -du -s /path
0  /path

如果有的话 0 字节文件或空目录，结果仍然是 0 .