Exit a login shell.
SYNTAX 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
"We want the finest wines available to humanity. And we want them here and we want them now" ~ Bruce Robinson / Withnail and I
exit - Exit session
<ctrl><d> - End of File
logname - Print current login name
Equivalent Windows command: EXIT - Quit the CMD shell