pjh@mccc.UUCP (Peter J. Holsberg) (01/30/88)
I would like to have my users logout via a shell script "off" rather
than with ^d. The script I wrote is very simple, but 'exit' has no
effect.
echo "OFF \c:" >> /usr/.logins
who am i >> /usr/.logins
exit
The correct entries appear in /usr/.logins, but 'exit' seems to be
ignored. Typing 'exit' at the prompt does in fact do what I want --
i.e., act as a substitute for ^d. I see that exit(2) is a system call
that terminates the calling process. Oh oh! It terminates 'off' but
doesn't log the user off! Rats!@!@#$%
Can anyone suggest a way (SysVr3.0) to do what I want? Thanks.
.
--
Peter Holsberg UUCP: {rutgers!}princeton!mccc!pjh
Technology Division CompuServe: 70240,334
Mercer College GEnie: PJHOLSBERG
Trenton, NJ 08690 Voice: 1-609-586-4800ok@quintus.UUCP (Richard A. O'Keefe) (01/30/88)
In article <169@mccc.UUCP>, pjh@mccc.UUCP (Peter J. Holsberg) writes: > I would like to have my users logout via a shell script "off" rather > than with ^d. > Can anyone suggest a way (SysVr3.0) to do what I want? Thanks. Don't use a script. Use a shell function. Then it'll be running in the login shell. By the way, there is a potential surprise anyway: login: user-logs-in $ ed myfile !off Here we have login shell-->ed-->subshell, and you can't log out of the subshell. Since you are writing records to a log file, presumably you do something like this on login: echo ON $USER `tty` >>logfile Do one more thing: echo $$ON $USER `tty` Now to logout, you can do echo OFF $USER `tty` >>logfile CODE="ON $USER `tty`" kill -HUP `egrep -e "$CODE$" logfile | tail -1 | sed -e "s/ON.*//"` This should work from a subshell.
kathy@bakerst.UUCP (Kathy Vincent) (01/31/88)
In article <169@mccc.UUCP> pjh@mccc.UUCP (Peter J. Holsberg) writes: >I would like to have my users logout via a shell script "off" rather >than with ^d. The script I wrote is very simple, but 'exit' has no >effect. ... > >The correct entries appear in /usr/.logins, but 'exit' seems to be >ignored. The exit in your shell script is only going to get you out of that script. In fact, sending exit codes is one way of communicating between scripts ( if [ script exits with a number "n" ] then ...). A friend of mine solved that problem thusly. He was only interested in his own .profile, but trap '$HOME/.logout' 0 Which is to say, "when you receive the logoff signal, execute $HOME/.logout first and THEN log off." I believe there's probably a problem with this, though: Traps can be reset, so a user could, as I understand it, ask to have something else happen at signal 0 , thereby negating what you're trying to do. Someone correct me if I'm wrong about this (I'm sure someone will) 'cuz I'd like to know. Kathy Vincent ------> {ihnp4|mtune|codas|ptsfa}!bakerst!kathy ------> {ihnp4|mtune|burl}!wrcola!kathy ------> { favourite AT&T gateway }!wruxe!unix
dave@lsuc.uucp (David Sherman) (02/01/88)
> I would like to have my users logout via a shell script "off" rather > than with ^d. $ cat /usr/bin/bye clear echo "Bye now. A parting quote:" /usr/games/fortune kill -1 0 $ David Sherman -- { uunet!mnetor pyramid!utai decvax!utcsri ihnp4!utzoo } !lsuc!dave
pjb@dutesta.UUCP (P.J. Brand) (02/01/88)
From article <169@mccc.UUCP>, by pjh@mccc.UUCP (Peter J. Holsberg): > I would like to have my users logout via a shell script "off" rather > than with ^d. The script I wrote is very simple, but 'exit' has no > effect. > > echo "OFF \c:" >> /usr/.logins > who am i >> /usr/.logins > exit > > The correct entries appear in /usr/.logins, but 'exit' seems to be > ignored. Typing 'exit' at the prompt does in fact do what I want -- > i.e., act as a substitute for ^d. I see that exit(2) is a system call > that terminates the calling process. Oh oh! It terminates 'off' but > doesn't log the user off! Rats!@!@#$% > > Can anyone suggest a way (SysVr3.0) to do what I want? Thanks. > . > > -- The script would work if your users would call: . /usr/local/off or wherever your script is stored. But, instead, you would probably prefer to use: kill -9 0 instead of the exit, to make the script work as expected. ============================================================================== Paul Brand Delft University of Technology INTERNET : karel@dutesta.UUCP Faculty of Electrical Engineering UUCP : ..!mcvax!dutrun!dutesta!karel
avr@mtgzz.UUCP (XMRP50000[jcm]-a.v.reed) (02/02/88)
In article <169@mccc.UUCP>, pjh@mccc.UUCP (Peter J. Holsberg) writes: > I would like to have my users logout via a shell script "off" rather > than with ^d. Any sh script can kill its parent shell (in your case, the login shell) with kill -1 `ps -f -p $$|grep $$|cut -c16-20` This assumes the System V ps spec, but could be adapted to any UNIX(tm) system and any version of /bin/sh. Adam Reed (mtgzz!avr)
larry@jc3b21.UUCP (Lawrence F. Strickland) (02/02/88)
in article <1062@bakerst.UUCP>, kathy@bakerst.UUCP (Kathy Vincent) says: > > In article <169@mccc.UUCP> pjh@mccc.UUCP (Peter J. Holsberg) writes: >>I would like to have my users logout via a shell script "off" rather >>than with ^d. The script I wrote is very simple, but 'exit' has no >>effect. ... > > trap '$HOME/.logout' 0 As you mentioned, exit will only get you out of the script, not the enwrapped shell. I've always had good luck with: kill -9 0 in a shell script. This is a bit rough (as it kills ALL programs associated with the terminal, including background ones), but it has to be since a normal kill is ignored by the shell. I'm sure there is a better way, too... -- +--------------------------------------+-- St. Petersburg Junior College --+ | Lawrence F. Strickland | P.O. Box 13489 | | ...gatech!codas!usfvax2!jc3b21!larry | St. Petersburg, FL 33733 | +-(or) ...gatech!usfvax2!jc3b21!larry -+-- Phone: +1 813 341 4705 ---------+
heff@flnexus.ATT.COM (Paul K Heffner) (02/03/88)
in article <3564@mtgzz.UUCP>, avr@mtgzz.UUCP (XMRP50000[jcm]-a.v.reed) says: > In article <169@mccc.UUCP>, pjh@mccc.UUCP (Peter J. Holsberg) writes: >> I would like to have my users logout via a shell script "off" rather >> than with ^d. > Any sh script can kill its parent shell (in your case, the login shell) with > kill -1 `ps -f -p $$|grep $$|cut -c16-20` The command: stty 0 sets your baud rate to zero, forces a hangup which causes SIGHUP to be sent to all correspondent processes thereby 86'ing them. This has been used with nominal success in some of the 'bye' routines on our systems here. Paul Heffner AT&T Orlando
emigh@ncsugn.ncsu.edu (Ted H. Emigh) (02/04/88)
In article <144@flnexus.ATT.COM> heff@flnexus.ATT.COM (Paul K Heffner) writes: > In article <169@mccc.UUCP>, pjh@mccc.UUCP (Peter J. Holsberg) writes: >> I would like to have my users logout via a shell script "off" rather >> than with ^d. >The command: >stty 0 >sets your baud rate to zero, forces a hangup which causes SIGHUP to >be sent to all correspondent processes thereby 86'ing them. This >has been used with nominal success in some of the 'bye' routines >on our systems here. Of course, this will only work if you want them to be disconnected, rather than merely logout. In particular, if you have people using su, they may not want to be disconnected. -- Ted H. Emigh, Dept. Genetics and Statistics, NCSU, Raleigh, NC uucp: mcnc!ncsuvx!ncsugn!emigh internet: emigh%ncsugn.ncsu.edu BITNET: NEMIGH@TUCC @ncsuvx.ncsu.edu:emigh@ncsugn.ncsu.edu
jonl@sco.COM (Owl Of Nite) (02/12/88)
+-I seem to recall emigh@ncsugn.UUCP (Ted H. Emigh) writing: | | In article <144@flnexus.ATT.COM> heff@flnexus.ATT.COM (Paul K Heffner) writes: | > In article <169@mccc.UUCP>, pjh@mccc.UUCP (Peter J. Holsberg) writes: | >> I would like to have my users logout via a shell script "off" rather | >> than with ^d. | | >The command: | | >stty 0 | | >sets your baud rate to zero, forces a hangup which causes SIGHUP to | >be sent to all correspondent processes thereby 86'ing them. This | >has been used with nominal success in some of the 'bye' routines | >on our systems here. | | Of course, this will only work if you want them to be disconnected, rather | than merely logout. In particular, if you have people using su, they may | not want to be disconnected. | | | | -- | Ted H. Emigh, Dept. Genetics and Statistics, NCSU, Raleigh, NC | uucp: mcnc!ncsuvx!ncsugn!emigh internet: emigh%ncsugn.ncsu.edu | BITNET: NEMIGH@TUCC @ncsuvx.ncsu.edu:emigh@ncsugn.ncsu.edu Also, something to be noted is that when using rlogin (at least on 4.2 and 4.3 BSD machines) and stty 0 will be completely ignored by the pseudo tty. if the world was beige, id paint it a different color =============================================================================== jon luini || WORK: 408-425-7222 || HOME: 408-423-2917 Work: || jonl@sco.com || ...!{uunet, ihnp4, ucbvax!ucscc}!sco!jonl Evil: || niteowl@ssyx.ucsc.edu || ...!{ucbvax}!ucscc!ssyx!niteowl ===============================================================================