Internally, Env uses anuse Env; use Env qw(var1 var2 ...);
importfunction that ties suitably named environment variables to global Perl variables with the same names. By default, it ties all variables yielded by
keys %ENV. A "suitable" environment has a name that begins with an alphabetic character and contains only alphanumeric characters or underscores.
use Env is invoked with arguments, the arguments are
as a list of environment variables to
tie, but the variables don't have to
exist yet. After a variable has been tied, you can use it
like a normal variable, accessing or changing its value.
You untie a variable by setting its value to