Populate a field on node creation I have a content type "abc". I have a field "listing id". I want this field to be prepopulate starting from  1 and autoincrement" on every "abc" node creation. 

How can I do this.
It looks like you can use the Serial Field module to accomplish this. 

From the Serial Field page on Drupal.org:


  Usage
  
  You can add a serial field to any type at admin/content/types ->
  manage fields. In the New Field form select Serial as the type of data
  and label and field name as your choice, and Save. No other settings.