radavis/linux-env-variables.md

Created October 3, 2017 19:30

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linux-env-variables.md

Linux Environment Variables

Bash reads different configuration files depending on how the shell session is started.

Shell Sessions

login: A user was authenticated (via user/password).
non-login: A new shell session was created within an authenticated session. A user was not authenticated.
interactive: A shell session attached to a terminal session (foreground).
non-interactive: A shell session not attached to a terminal session (background).

Examples:

Signing into a machine using SSH: Interactive Login Shell Session
Running a script: Non-Interactive, Non-Login Shell Session

Login Shell Session

reads /etc/profile, first. then,
~/.bash_profile
~/.bash_login
~/.profile

Non-Login Shell Session

/etc/bash.bashrc - system-specific configuration
~/.bashrc - user-specific configuration (common location for setting ENV variables)

Non-Interactive Shell Session

Reads the config file defined by BASH_ENV.

System-wide Configuration

/etc/profile
/etc/bash.bashrc
/etc/environment - if using nginx

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