How do I display the buffer number of the current buffer/file?

You can use 2<CTRL-G> command to display the buffer number for the current file/buffer. Note the use of count before the CTRL-G command. If the count is greater than 1, then Vim will display the buffer number. You can also use the following command to display the current buffer number:

    :echo bufnr("%")

You can also include the “%n” field to the ‘statusline’ option to display the current buffer number on the statusline.