Exit a login shell.
logout [n]Returns a status of n to the shell''s parent.
A login shell, is your topmost shell, and is started when you log in.
When you terminate a login shell (via the commands `exit'', `logout,'' or the end of file [^D]), you are logged out completely.
A `sub-shell'' is a shell created after login, either by loading a new shell or opening a window with a graphics interface. A sub-shell usually will not accept the command `logout'' to terminate, you must use `exit'' or ^D.
When you terminate a sub-shell, you are returned to the process or shell that created it.
Example (starting from a bash shell)
% # now in the tcsh shell
$ # now back in the bash shell
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