change environment variables linux code example

Example 1: shell set environment variable

export VARNAME="my value"      # shorter, less portable version

Example 2: linux set environment variable

# Linux - Bash 

# syntax 
# export *<variable-name>=*<variable-value>;

# example 
export ORACLE_SID='sales_database';

Example 3: set environment variable linux

export JAVA_HOME=/opt/openjdk11