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Diffstat (limited to 'Help/variable/ENV.rst')
| -rw-r--r-- | Help/variable/ENV.rst | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/Help/variable/ENV.rst b/Help/variable/ENV.rst index 368152aeb..2b439342e 100644 --- a/Help/variable/ENV.rst +++ b/Help/variable/ENV.rst @@ -1,7 +1,12 @@ ENV --- -Access environment variables. +Operator to read environment variables. -Use the syntax ``$ENV{VAR}`` to read environment variable ``VAR``. See also -the :command:`set` command to set ``ENV{VAR}``. +Use the syntax ``$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. |