🚀 go-pugleaf

login should be a builtin, because if jimmy, used to some other leading
brands of shell, does
bash$ login jenny
as he turns over the terminal to jenny, and then later jenny logs out
and walks away, jimmy's bash will be sitting there, so some baddie
will take advantage of it, and then the whole school will hear some
rumor that bash is a security hazard.  Plus, two out of three selected
big name shells do it:
bash$ type login
login is /usr/bin/login
bash$ ksh
$ type login
login is a shell builtin
$ sh
$ type login
login is a shell builtin

Plus csh also keeps jimmy out of trouble.

Plus it's unreasonable to expect jimmy to memorize "'exec login' when
under bash".