How to suppress `When done with a buffer, type C-x #` warning message?

Question

When I open a buffer I keep seeing following message in the minibuffer: When done with a buffer, type C-x # . Is it possible completely to suppress this message?

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I'm using emacsclient -t -q to open GNU Emacs 26.3. Following lines are in the .zshrc file.

export ALTERNATE_EDITOR=""
export EDITOR="emacsclient -t"

Answer 1

The only way to avoid that message with Emacs earlier than 28.1 is to invoke emacsclient with the -n (--nowait) option.

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Starting with Emacs 28.1 (basically, current upstream at the time of writing), there is a variable to do that:

Customizing server-client-instructions and toggling it off should turn off that message, but I cannot confirm: either my emacs session is curdled or there is something else that's funky.

The doc string of the variable says:

Documentation:

If non-nil, display instructions on how to exit the client on connection.

If nil, no instructions are displayed.

EDIT: after restarting emacs (actually, a newer version that I had installed - this was an opportunity to kill the old emacs and start with the new version), I can see the variable and it does seem to work as described. The explanation here is that I went from a version that did not have the variable to a version that did.

Here's the commit that added the variable.

EDIT (in response to the OP's comment): to customize the variable, ask for its description with C-h v server-client-instructions RET, hit the customize link where it says "You can customize this variable" and when the customize interface comes up, hit the Toggle button to toggle it off (nil) and then hit Apply and Save to save it permanently.