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  1. or download this
    sub usage
{
...
    "v|verbose:1" => \$opt_v,
    "x|xfsgdft!"  => \my $opt_x,
    ) or usage (1); # FAIL: STDERR
  2. or download this
    > some_app --help |& less
  3. or download this
    $ perl foo.pl big_file.txt >excerpt.csv
Opening file …
...
Generating CSV … 1 2 3 4 5
Done!
$