add 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: add environment variable linux

vi ~/.bash_profile

Example 4: add environment variable linux

source ~/.bash_profile

Example 5: add environment variable linux

export JAVA_HOME=/opt/openjdk11