linux add environment variable permanently code example

Example 1: set permanant environemt variable

$EDITOR ~/.profile
#add lines at the bottom of the file:  
     export LD_LIBRARY_PATH=/usr/lib/oracle/11.2/client64/lib
     export ORACLE_HOME=/usr/lib/oracle/11.2/client64

Example 2: add environment variable linux

vi ~/.bash_profile

Example 3: add environment variable linux

export JAVA_HOME=/opt/openjdk11