Are there comments in command-line mode?

Question

Does VIM support comments in command-line mode?

I have tried the most popular variants including .VIMRC comments but neither worked:

:echo "hello" // echo usage
:echo "hello" /* echo usage */
:echo "hello" "echo usage

Or do the comments in this mode just don't fit in the VIM paradigm?

Update: It seems there is a problem with the commands that end with ". Because all the others work, e.g. copying a buffer content:

:let @a=@0 " buffer copying

There must be some escaping. The suggested solution with |" seems to work for

:echo "hello" |" echo usage

but doesn't work for user-defined commands (those that are defined in .vimrc and whose names start with a capital letter) e.g.

:SearchHyphenation " user-defined

Answer 1

Vimscript does have comments and they're started by the " character.

They always work at the beginning of the line:

" echo usage
echo "hello"

They sometimes work inline, but not always. It depends on the command.

See :help :comment, which says:

" after a command causes the rest of the line to be ignored. This can be used to add comments. [...]

It is not possible to add a comment to a shell command [...] and a few others (mainly commands that expect expressions) that see the " as part of their argument:

• :argdo
• :autocmd
• [...]
• :echo (and the like)