The Env:: import() function ties environment variables with suitable names to global Perl variables with the same names. By default it does so with all existing environment variables (keys %ENV). If the import function receives arguments, it takes them to be a list of environment variables to tie; it's okay if they don't yet exist.
After an environment variable is tied, merely use it like a normal variable. You may access its value
or modify it
however you'd like. To remove a tied environment variable from the environment, assign it the undefined value