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- env
- This variable is maintained by Tcl as an array whose
- elements are the environment variables for the process.
- Reading an element will return the value of the
- corresponding environment variable. Setting an element
- of the array will modify the corresponding environment
- variable or create a new one if it doesn't already
- exist. Unsetting an element of env will remove the
- corresponding environment variable. Changes to the env
- array will affect the environment passed to children by
- commands like exec. If the entire env array is unset
- then Tcl will stop monitoring env accesses and will not
- update environment variables.
-