how to display a link on a node view page? I want to display a link on a node view page just like the "Add new comment" link.
How should I do this?

I think it can be done through hook_node_view(),  but how can I use this hook?
In your implementation of hook_node_view(), add an element to the $node-&gt;content array. The element should be a renderable array as expected by drupal_render().