how to see environment variables in linux code example

Example 1: print environment variables linux

ENV_VAR="hello world"
printenv ENV_VAR

Example 2: env variable bash

#print enviornment variable bash
echo $TEST_VAR

Example 3: linux set environment

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

# example
setenv SHELL /usr/bin/bash

Example 4: linux set environment variable

# Linux - Bash 

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

# example 
export ORACLE_SID='sales_database';

Example 5: env variable bash

#Set envionrment variable bash
TEST_VAR='Hello World!'