Login notifications, pam_exec scripting

If you like monitoring, you might want to receive notifications at every (or only root) login, in addition to logs.

/etc/profile, bashrc, etc.

One can first think of a script in /etc/profile - I saw that solution on many websites - but it is wrong because the user can connect with ssh /bin/sh and it will not run any login script. Also, this kind of login does not appear in last/wtmp but only in auth.log by sshd (because it's not considered as an "interactive login").