Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watmath!clyde!cbosgd!hal!ncoast!allbery
From: allbery@ncoast.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: Built-in login command (/bin/lo
Message-ID: <2682@ncoast.UUCP>
Date: Sat, 20-Jun-87 16:13:38 EDT
Article-I.D.: ncoast.2682
Posted: Sat Jun 20 16:13:38 1987
Date-Received: Sun, 21-Jun-87 12:06:09 EDT
References: <91@decvax.UUCP> <142700003@tiger.UUCP> <4705@columbia.UUCP>
Reply-To: allbery@ncoast.UUCP (Brandon Allbery)
Followup-To: comp.unix.wizards
Organization: Cleveland Public Access UN*X, Cleveland, Oh
Lines: 27

As quoted from <4705@columbia.UUCP> by francus@cheshire.columbia.edu (Yoseff Francus):
+---------------
| In article <142700003@tiger.UUCP> rjd@tiger.UUCP writes:
| >> 	Back at U. of NH, I discovered by accident that if
| >> 	I ran /bin/login directly (not "exec" it, which the
| >> 	builtin shell command "login" does) and logged into
| >> 	an account with no password (they had a captive
| >> 	account which ran /bin/who), when /bin/login exited
| >> 	the entry in the /etc/utmp kept the new login name.
| >   Interesting, AT&T Sys V, release 2.0 and 3.0 's mail command uses your
| >LOGNAME variable as a first choice as your ID when sending mail.  (Probably
| >and unimportant bug...)
+---------------

This is especially dumb considering that System V fixed the "login" bug
mentioned above (since the process ID of the process group leader is saved,
/bin/login can check to see if it's being run by a non-login shell).

++Brandon
-- 
Copyright (C) 1987 Brandon S. Allbery.  Redistribution permitted only if the
    redistributor permits further redistribution.  (Stargate take heed!)
     ---- Moderator for comp.sources.misc and comp.binaries.ibm.pc ----
Brandon S. Allbery	{decvax,cbosgd}!cwruecmp!ncoast!allbery
aXcess Company		{ames,mit-eddie,talcott}!necntc!ncoast!allbery
6615 Center St. #A1-105	necntc!ncoast!allbery@harvard.HARVARD.EDU
Mentor, OH 44060-4101	+01 216 974 9210	(also eddie.MIT.EDU)