查看HDFS上的文件，文件是否为空的命令总结

-test -[defsz] 测试文件是否存在:
Answer various questions about , with result via exit status.
-d return 0 if is a directory.
-e return 0 if exists.
-f return 0 if is a file.
-s return 0 if file is greater than zero bytes in size.
-z return 0 if file is zero bytes in size, else return 1.

查看文件是否为空，则用-s

hadoop fs -test -s /user/hive/ch_tv_data/usrp_basic_info
if [ $? -ne 0 ]; then
    echo "Directory not exists!"
else
    echo "OK"
fi

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