gedit /etc/profile

export JAVA_HOME=/opt/java/jdk1.8.0_261
export CLASSPATH=.:${JAVA_HOME}/lib:${JAVA_HOME}E/lib
export HADOOP_HOME=/usr/local/hadoop-2.10.0
export PATH=${JAVA_HOME}/bin:$PATH:${HADOOP_HOME}/bin:${HADOOP_HOME}/sbin
export HIVE_HOME=/usr/local/hadoop-2.10.0/hive/apache-hive-1.2.2-bin
export PATH=${JAVA_HOME}/bin:$PATH:${HIVE_HOME}/bin:${HIVE_HOME}/sbin