View::Value->new({
      name          => 'create_key',
      opt_spec      => [qw(
                              host=s
                              #few more values
                      )],
      db_connection => [qw/ hello /],
      handler       => sub { foo (@_) },
  });


sub foo {
      my @opt        = View::Value::get_opt;
      my %handler_for = (
          host         => sub { create(@_) },
          #few more key, value pair
      );

sub create {
     my %opt    = @_;
     # Assume that $key has the public key

     for my $host (split /,/, $opt{host}) {
         system qq{cat $key | ssh -q $host 'umask 077; test -d .ssh ||
+ mkdir .ssh ; cat >> .ssh/keys'}
     }

     return;
}
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The function foo() is called through View::Value->new. I think that this code takes command-line argument as well. Let me know if this is the case. Kindly, help me with the following: 1. I am nowhere able to find the routine get_opt. Is it a pre-defined one 2. Will the function create() be called only when I give --host during runtime? 3. Now what values are passed to create() 4. what does that system command mean? what is its order or execution? 5. What is that host=s?