Introduction

Environment variables are used to store system-wide values that can be used by any user and process under the operating system. Setting environment variables is essential in the steps of certain installations we covered such as How To Install Java or How To Install Java On Raspberry Pi.

This tutorial explains how to view, add, and remove temporary and permanent environment variables on macOS.

Setting environment variables in macOS

Prerequisites

  • A system running the lastest version of macOS
  • Access to the terminal
  • A user with admin-level privileges

Check Current Environment Variables

There are two ways to check current environment variables in macOS:

1. Display and review a list of all current environment variables.

2. Display and review a specific environment variable.

List All Environment Variables

Use the printenv command to display a list of currently set environment variables:

printenv

Listing all nevironmental variables using the printenv command

Note: If you want to display the complete list of shell variables, use the set command.

Check A Specific Environment Variable

If you want to display the value of any specific environment variable, use the echo command:

echo $[variable name]

For example, to check the value of the PATH variable which stores a list of directories with executable files, use the
echo command:

echo $PATH

Note: Always use the $ prefix when specifying a variable name.

Set Temporary Environment Variable

The value you assign to a temporary environment variable only lasts until you close the terminal session. This is useful for variables you need to use for one session only or to avoid typing the same value multiple times.

Assign a temporary environment variable with the export command:

export [variable_name]=[variable_value]

Where:

      • [variable_name]: The name for the new temporary environment variable you want to set.
      • [variable_value]: The value you want to assign to the new variable.

The export command also allows you to add new values to existing environment variables:

export [existing_variable_name]=[new_variable_value]:$[existing_variable_name]

Where:

      • [existing_variable_name]: The name of the environment variable you want to add a new value to.
      • [new_variable_value]: The value you want to add to an existing variable.

For example, if you want to add a custom folder path to the PATH variable, use:

export PATH=/Users/test/test_folder:$PATH

Set Permanent Environment Variable

Permanent environment variables are added to the .bash_profile file:

1. Find the path to .bash_profile by using:

~/.bash-profile

2. Open the .bash_profile file with a text editor of your choice.

3. Scroll down to the end of the .bash_profile file.

4. Use the export command to add new environment variables:

export [variable_name]=[variable_value]

5. Save any changes you made to the .bash_profile file.

6. Execute the new .bash_profile by either restarting the terminal window or using:

source ~/.bash-profile

Unset Environment Variable

Use the unset command to remove an environment variable:

unset [variable_name]

Conclusion

After following this tutorial, you should know how to set temporary and permanent environment variables in macOS. This should make it easier for you to configure software packages in the future.

Looking for a different OS tutorial? Check out our guides on How To Set Environment Variables In Linux and How To Set Environment Variables In Windows.

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