Env

External

• https://www.gnu.org/software/coreutils/manual/html_node/env-invocation.html

Internal

• Linux
• Shebang

Overview

Run a command with a modified environment, or just print the environment if no argument is provided.

/usr/bin/env [utility]

/usr/bin/env bash

No Argument Use

Displays environment values.

Modify the Environment to Run a Command

env SOME_VAR='some value' printenv

will display, among other environment variables, SOME_VAR.

Use env to Dynamically Modify PATH

python --version # returns one version
env PATH=/tmp/some-venv:${PATH} python --version # returns a different version

Use on the Shebang Line

https://www.baeldung.com/linux/bash-shebang-lines

The env command works by instructing the system to look for the specified interpreter through the PATH variable and use the first occurrence found.