how to set environment variable linux code example

Example 1: shell set environment variable

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

Example 2: linux set environment

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

# example
setenv SHELL /usr/bin/bash

Example 3: linux set environment variable

# Linux - Bash 

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

# example 
export ORACLE_SID='sales_database';

Example 4: how to set up env variable

npm install dotenv --save

Next add the following line to your app: "require('dotenv').config()"

Then create a .env file at the root directory of your application 
and add the variables to it.

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