Not login shell.
As the shell can be invoked recursively, you can be "in" an instance of
the shell that is not the one that was started when you first
logged in. You must,
however, be executing this login shell to
log out. To terminate a
shell execution, enter a [CTRL-D] sequence or type "exit". An
additional "%" prompt character will appear on the terminal for every
shell termination you effect by a [CTRL-D] or "exit". When you are in
your original login shell, a [CTRL-D] will result in the message
<![CDATA[
Use "logout" to logout.
]]>
At this point, simply do what the message says! If you type "exit" when
you are in your login shell, you will be logged out!
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