Shell how to set environment variables from .env file

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Let's say I have .env file contains lines like below:

USERNAME=ABC
PASSWORD=PASS

Unlike the normal ones have export prefix so I cannot source the file directly.

What's the easiest way to create a shell script that loads content from .env file and set them as environment variables?

If your lines are valid, trusted shell but for the export command

This requires appropriate shell quoting. It's thus appropriate if you would have a line like foo='bar baz', but not if that same line would be written foo=bar baz

set -a # automatically export all variables
source .env
set +a

If your lines are not valid shell

The below reads key/value pairs, and does not expect or honor shell quoting.

while IFS== read -r key value; do
  printf -v "$key" %s "$value" && export "$key"
done

Shell how to set environment variables from .env file, If your lines are valid, trusted shell but for the export command. This requires appropriate shell quoting. It's thus appropriate if you would have a  The PowerShell Environment provider lets you access environment variables in a PowerShell drive (the Env: drive). This drive looks much like a file system drive. To go to the Env: drive, type: Set-Location Env: Use the Content cmdlets to get or set the values of an environment variable.

This will export everything in .env:

export $(xargs <.env)

Note: this requires the environment values to not have whitespace. If this does not match your use case you may need to use a more complicated command.

How to Set and List Environment Variables in Linux, In Linux and Unix based systems environment variables are a set of In this guide, we will explain to read and set environment and shell variables. the path to executable files, or the system locale and keyboard layout settings. The most used command to displays the environment variables is printenv . Environment variables defined in the .env file are not automatically visible inside containers. To set container-applicable environment variables, follow the guidelines in the topic Environment variables in Compose , which describes how to pass shell environment variables through to containers, define environment variables in Compose files, and

Found this:

http://www.commandlinefu.com/commands/view/12020/export-key-value-pairs-list-as-environment-variables

while read line; do export $line; done < <(cat input)

UPDATE So I've got it working as below:

#!/bin/sh
while read line; do export $line; done < .env

How To Set Environment Variables, Learn why environment variables are useful and how to set them on path to it in your terminal since the shell will check the local directory as well as all Create a .env file in your project folder (typically at the root) and place  To define permanent environment variables, create a file called .env in the root of your project: REACT_APP_NOT_SECRET_CODE=abcdef. Note: You must create custom environment variables beginning with REACT_APP_. Any other variables except NODE_ENV will be ignored to avoid accidentally exposing a private key on the machine that could have the same

How do I set an environment variable?, You can set an environment variable on a Linux, Windows, or Mac platform Linux To set an environment variable on Linux, enter the following command at a shell prompt, To find out what environment variables are set, use the env how to create a "plist" file to store system-wide environment variables  Let's see how we can manage environment variables with PowerShell. PowerShell has a feature called providers that creates one or more drives, which are hierarchical, file system-like structures that allow a user to manage various areas in Windows. One of those providers is for environment variables called Environment.

Environment variables in Compose, You can set default values for any environment variables the shell take precedence over those specified in the .env file. Create temp file. Write all current environment variables values to the temp file. Enable exporting of all declared variables in the sources script to the environment. Read .env file. All variables will be exported into current environment. Disable exporting of all declared variables in the sources script to the environment.

Here's how you can actually use Node environment variables, How do I permanently set an environment variable in Linux? Below are some of the most common environment variables: USER - The current logged in user. HOME - The home directory of the current user. EDITOR - The default file editor to be used. This is the editor that will be used when you type edit in your terminal. SHELL - The path of the current user’s shell,

Comments
  • How are values with spaces defined? Is it var="value with spaces", or var=value with spaces? The two call for quite different approaches.
  • Possible duplicate of Set environment variables from file
  • Consider if your .env was created with the following code: printf '%s\n' 'password="two words"' 'another=foo' >.env. In that case, the arguments passed to export would be password=two, words, and another=foo; words would no longer be part of the password, and would be a separate argument on its own (so the command would be trying to export a preexisting variable with the name words).
  • Would export $(xargs -L 1 <.env) solve that case @CharlesDuffy ?
  • < <(cat input) is a pretty complicated way to say < input, isn't it?
  • export "$line" is going to be a bit better-behaved, assuming it's one variable to a line but that the values are able to contain spaces.
  • That said, look at what this code does with line="hello world" -- you get the quotes exported as part of the literal data, rather than treated as syntax. That might be fine, but since the OP was saying the only reason they couldn't source the file was the lack of export prefixes, it very well might not.
  • Also, you'll want to add the argument -r to read so it doesn't mangle backslashes, and quote "$line" so its contents don't get string-split and glob-expanded before export sees them.