Trapping user logins in python ( post #1)

[Jeff Epler]

I don't know of a portable way for an inetd-style daemon to "listen" for
user logins.

On some systems (including RedHat/Fedora and debian), you may be able to
use PAM to do this.  (pam modules don't just perform authentication,
they can take other actions.  As an example, pam_lastlog "prints the
last login on successful login".  I'm not sure what priviledge a pam
module has when it executes.

A more standard way to do this would be to place lines in /etc/profile
/etc/csh.login and so forth for any other shells used on your system.
RedHat-style systems have an /etc/profile.d where you can drop a file
that will be executed at login, too.  This will, of course, be executed
with the user's privilege level.  Another problem with this approach is
that /etc/profile is executed for a "login shell", but a graphical login
is not a login shell.

Jeff
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