I created text file in linux containing three paragraphs. so now I want to display each paragraph with line numbers in result while displaying the content of file.

Content of my file is something like.

```

      Below are content navigation systems to help you browse theencyclopedia. They serve as an alternative to the search.

      Below are content navigation systems to help you browse the encyclopedia. They serve as an alternative to the search.

      Below are content navigation systems to help you browse the encyclopedia. They serve as an alternative to the search.

```

Now I want to print result as

1 Below are content..........(for first paragraph)

2 Below are content..........(for second paragraph) and so on.

each paragraph in file contains one line gap

As well as I also need to print the last paragraph only from the above file by using another command. 

I am using ubuntu.