set an environment variable in linux code example

Example 1: linux set environment

# syntax 
# setenv SHELL *

# example
setenv SHELL /usr/bin/bash

Example 2: linux set environment variable

# Linux - Bash 

# syntax 
# export *=*;

# example 
export ORACLE_SID='sales_database';

Example 3: how to set environment variables in linux

export JAVA_HOME=/opt/openjdk11