How to manage Environment variables in Linux ?

About

This page is about Process Environment variable in Linux.

Management

Set

Shell

They are set generally with the shell. See Variable

PAM

pam permits also an admin to set environment variable: See pam-env

The file used to set the environment variable are the below one:

• /etc/security/pam_env.conf: Default configuration file - When someone logs in, this file is read and the environment variables are set according.
• /etc/environment: Default environment file - simple KEY=VAL pairs on separate lines
• HOME/.pam_environment: User specific environment file

Get the env of a process

• Process env variable listing

Start with a clean environment

clean env