ENV | |
--- | |
Operator to read environment variables. | |
Use the syntax ``$ENV{VAR}`` to read environment variable ``VAR``. | |
To test whether an environment variable is defined, use the signature | |
``if(DEFINED ENV{<name>})`` of the :command:`if` command. | |
See the :command:`set` and :command:`unset` commands to see how to | |
write or remove environment variables. |