How can you customize environment variables in Jenkins?

To customize Jenkins environment variables, you can follow these steps:

1. Open the management page of Jenkins and click on “System Management” in the left menu.
2. Navigate to the “Global Properties” section on the system management page and click on “Environment Variables”.
3. Check the option “Enable global environment variables” on the Environment Variables page.
4. Click on the “Add Environment Variable” button, enter the variable name and value in the popup dialog box, and click on the “Add” button. You can add multiple environment variables.
5. Click the “Save” button to save the settings.

You have now successfully customized the environment variables in Jenkins. These custom environment variables can be used in Jenkins jobs or build processes to reference variable values.