package Env;=head1 NAMEEnv - Perl module that imports environment variables=head1 DESCRIPTIONPerl maintains environment variables in a pseudo-associative-arraynamed %ENV.  For when this access method is inconvenient, the Perlmodule C<Env> allows environment variables to be treated as simplevariables.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 (C<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     @path = split(/:/, $PATH);or modify it    $PATH .= ":.";however you'd like.To remove a tied environment variable fromthe environment, assign it the undefined value    undef $PATH;=head1 AUTHORChip Salzenberg <chip@fin.uucp>=cut=sub import {    my ($callpack) = caller(0);    my $pack = shift;    my @vars = @_ ? @_ : keys(%ENV);    foreach (@vars) {	tie ${"${callpack}::$_"}, Env, $_ if /^[A-Za-z_]\w*$/;    }}sub TIESCALAR {    bless \($_[1]);}sub FETCH {    my ($self) = @_;    $ENV{$$self};}sub STORE {    my ($self, $value) = @_;    if (defined($value)) {	$ENV{$$self} = $value;    } else {	delete $ENV{$$self};    }}1;