How to display runtimepath value in echo or echomsg?

Question

I have modified the 'runtimepath' in my .vimrc file. As I am having problems of not found files, I would like to display the runtimepath value in an :echo or :echomsg

I already know about the existence of :scriptnames and the possibility of checking the value with :set runtimepath, but I specifically need to display it with :echo or :echomsg commands.

I have already tried, without success, the following:

• :echo runtimepath
• :echo expand(runtimepath)
• :echo expand('runtimepath')

Answer 1

Everyting that is set using :set is an option in vim. Options are described in the help between single quotes, like in :h 'runtimepath'

If you check the documentation page :h after-directory, it is said:

More entries are added when using |packages|. If it gets very long then :set rtp will be truncated, use :echo &rtp to see the full string.

Therefore, the answer to the question is:

:echo &runtimepath

As suggested by @d-ben-knoble in the comments, this approach creates a new buffer and reports in a much more legible way as each path is in a different line

:new | put =split(&runtimepath, ',')

Output is like

C:\Users\myusername/vimfiles
C:\Program Files (x86)\Vim/vimfiles
C:\Program Files (x86)\Vim\vim90
C:\Program Files (x86)\Vim\vim90\pack\dist\opt\matchit
C:\Program Files (x86)\Vim/vimfiles/after
C:\Users\myusername/vimfiles/after

Answer 2

There is another way that may be easier depending on the situation.

Sometimes I do things like this with the expression register (:h @=) knowing that settings can be accessed from expressions using a leading & (from :h expression-syntax in the expr10 section in my version)

While in insert mode:

<c-r>=&runtimepath<cr>

You could make it "clean" by combining with the split in @aturegano's answer:

<c-r>=split(&runtimepath, ',')<cr>