how to add env variable in ubuntu code example

Example 1: shell set environment variable

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

Example 2: how to set environment variable in ubuntu

sudo -H gedit /etc/environment

Example 3: bash set environment variable

# Linux - Bash

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

# example 
export ORACLE_SID='sales_database';