https://community.cloudera.com/t5/Support-Questions/Hadoop-Installation-Directory/m-p/105479#M68359 <P>One example:</P><PRE>[root@sandbox ~]# find / -name hadoop /usr/bin/hadoop [..] [root@sandbox ~]# ls -lrt /usr/bin/hadoop lrwxrwxrwx 1 root root 41 2015-10-27 12:29 /usr/bin/hadoop -&gt; /usr/hdp/current/hadoop-client/bin/hadoop</PRE><P>Here /usr/hdp/current/hadoop-client/bin/ will be your Hadoop home</P><P>HADOOP_HOME is not a global variable, it is used by Hadoop daemons from hadoop env file.</P> Wed, 02 Mar 2016 15:30:41 GMT KuldeepK 2016-03-02T15:30:41Z