Absolute path to a file containing environment variables for the service. This writes EnvironmentFile=. Prefix the path with - to ignore a missing file.

Each line in the file should normally be a shell-style assignment such as NAME=value. Common examples are /etc/default/myapp, /etc/sysconfig/myapp, or a private file under the application's directory.

For user units, use an absolute path to a file readable by the selected user, typically below that user's home directory such as /home/example/.config/myapp/environment.