set and persist global enviroment varialbe linux 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: linux set environment

# syntax 
# setenv SHELL *<filepath-of-file-containing-environment-settings>

# example
setenv SHELL /usr/bin/bash