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  1. or download this
    #!/usr/bin/perl -w

use strict;
...

my $result = GetOptions("username=s" => \$username,
                        "password=s" => \$password);
  2. or download this
    % myscript --username=foo --password=bar
  3. or download this
    $0 =~ s/password=\S+/password=xxx/;