Lets your program treat environment variables as simple variables instead
of having to access them from the %ENV pseudo-hash where they
are kept.
Internally, Env uses anuse Env; use Env qw(var1 var2 ...);
import function 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.When use Env is invoked with arguments, the arguments are
interpreted
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 undef.