When you login to the sandbox the default user is "hunk". You need to change it to "root" as I mentioned by:
$ su -
password:hunkadmin
When you are root, type:
jps
to make sure the expected Hadoop processes are running. If Hadoop is not running you can type the following to start Hadoop:
/etc/init.d/hadoop-master start
After that you can type either of these two to access to your data:
hadoop fs -ls /
hdfs dfs -ls /
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