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run(open => './path/to/', do=> 'tell what to do', save => './path1/to'
+);

sub run{
...
   $self->_open_it_and_run_it(open => $arg{open});
}
}

sub _open_it_and_run_it{
my ($self,%arg) = @_;
...
 }
 close IN:
}

run(open =>'./', ....);

run(open =>'./dir/', ....);