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  1. or download this
    >perl -le "use strict; use Env; print $CONFIG;"
Global symbol "$CONFIG" requires explicit package name
  2. or download this
    >perl -le "use strict; use Env qw( $WINDIR ); print $WINDIR;"
E:\WINNT
  3. or download this
    >perl -le "use strict; use Env; our $WINDIR; print $WINDIR;"
E:\WINNT
  4. or download this
    >perl -le "use strict; print $ENV{WINDIR};"
E:\WINNT