Env: Difference between revisions
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will display, among other environment variables, SOME_VAR. | will display, among other environment variables, SOME_VAR. | ||
==Use <tt>env</tt> to Dynamically Modify <tt>PATH</tt>== | |||
<syntaxhighlight lang='bash'> | |||
python --version # returns one version | |||
env PATH=/tmp/some-venv:${PATH} python --version # returns a different version | |||
</syntaxhighlight> | |||
=Use on the Shebang Line= | =Use on the Shebang Line= | ||
{{External|https://www.baeldung.com/linux/bash-shebang-lines}} | {{External|https://www.baeldung.com/linux/bash-shebang-lines}} | ||
The <code>env</code> command works by instructing the system to look for the specified interpreter through the <code>PATH</code> variable and use the first occurrence found. | The <code>env</code> command works by instructing the system to look for the specified interpreter through the <code>PATH</code> variable and use the first occurrence found. | ||
Revision as of 23:54, 2 May 2023
External
Internal
Overview
Run a command with a modified environment, or just print the environment if no argument is provided.
/usr/bin/env [utility]
/usr/bin/env bash
No Argument Use
Displays environment values.
Modify the Environment to Run a Command
env SOME_VAR='some value' printenv
will display, among other environment variables, SOME_VAR.
Use env to Dynamically Modify PATH
python --version # returns one version
env PATH=/tmp/some-venv:${PATH} python --version # returns a different version
Use on the Shebang Line
The env command works by instructing the system to look for the specified interpreter through the PATH variable and use the first occurrence found.