How do I inspect Vim variables?

Question

In .vimrc, there are several lines that look like:

let g:SuperTabDefaultCompletionType="<c-x><c-o>" 

How do I inspect them inside Vim? Something to this effect:

:echom &g:SuperTabDefaultCompletionType 

But that command results in an error:

E113: Unknown option: SuperTabDefaultCompletionType E15: Invalid expression: &g:SuperTabDefaultCompletionType 

How do I inspect these kinds of variables in Vim? Some plugins set some defaults which I need to inspect.

Answer 1

:echo g:SuperTabDefaultCompletionType 

works fine. It gives an error if the variable isn't defined.

Answer 2

Like lucapette wrote you can use :echo g:foo to inspect a variable. You can also use :let to see all defined variables and their values.