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  1. or download this
    use strict;
use warnings;
...
    warn join ",",@_;
    demo("hello", "world");
}
  2. or download this
    test,1 at d:/tmp/pm/getopt_long.pl line 23, <DATA> line 26.
Number of args: 2 at d:/tmp/pm/getopt_long.pl line 16, <DATA> line 26.
hello,world at d:/tmp/pm/getopt_long.pl line 18, <DATA> line 26.