Killing Emacs means terminating the Emacs program. To do
this, type C-x C-c (
two-character key sequence is used to make it harder to type by
accident. If there are any modified file-visiting buffers when you
type C-x C-c, Emacs first offers to save these buffers. If you
do not save them all, it asks for confirmation again, since the
unsaved changes will be lost. Emacs also asks for confirmation if any
subprocesses are still running, since killing Emacs will also kill the
subprocesses (see Shell).
C-x C-c behaves specially if you are using Emacs as a server. If you type it from a client frame, it closes the client connection. See Emacs Server.
Emacs can, optionally, record certain session information when you kill it, such as the files you were visiting at the time. This information is then available the next time you start Emacs. See Saving Emacs Sessions.
If the value of the variable
nil, C-x C-c assumes that its value is a predicate
function, and calls that function. If the result of the function call
nil, the session is killed, otherwise Emacs continues to
run. One convenient function to use as the value of
confirm-kill-emacs is the function
default value of
To further customize what happens when Emacs is exiting, see Killing Emacs.
To kill Emacs without being prompted about saving, type M-x kill-emacs.
C-z runs the command
suspend-frame. On a graphical
display, this command minimizes (or iconifies) the
selected Emacs frame, hiding it in a way that lets you bring it back
later (exactly how this hiding occurs depends on the window system).
On a text terminal, the C-z command suspends Emacs,
stopping the program temporarily and returning control to the parent
process (usually a shell); in most shells, you can resume Emacs after
suspending it with the shell command %emacs.
Text terminals usually listen for certain special characters whose meaning is to kill or suspend the program you are running. This terminal feature is turned off while you are in Emacs. The meanings of C-z and C-x C-c as keys in Emacs were inspired by the use of C-z and C-c on several operating systems as the characters for stopping or killing a program, but that is their only relationship with the operating system. You can customize these keys to run any commands of your choice (see Keymaps).