|
|
Home | Switchboard | Unix Administration | Red Hat | TCP/IP Networks | Neoliberalism | Toxic Managers |
| (slightly skeptical) Educational society promoting "Back to basics" movement against IT overcomplexity and bastardization of classic Unix | |||||||
|
|
|
|
xauth is an X Window utility for displaying locally the output of an X Window application running remotely. xauth serves the same purpose as the older xhost utility, but is considered far more secure. Under xauth a 'magic cookie', encoding information about your password and your current login session, must be found in the home directories of both your local and remote machines before one machine can display remotely on the other. This 'cookie' is stored in a file in your home directory called .Xauthority. Note that because this file is basically a password to your X Window display you must not give it group or world read or write permissions. The correct permissions for this file are read and write for you only, or 600 in octal. The presence of other than 600 permissions is cause for immediate account inactivation.
Since all ARSC SGI workstations (with the exception of grizzly) share the same NFS-mounted home directories, the .Xauthority file is visible to each machine, and the process of setting up a remote display is as simple as setting your DISPLAY variable. To run an X Window application on onyx2 and have it display on indigo43, for example, you would take the following steps:
on indigo43:
indigo43> rlogin onyx2 [initiate onyx2 session]
on onyx2:
onyx2> setenv DISPLAY indigo43.arsc.edu:0 [csh] or
onyx2> export DISPLAY=indigo43.arsc.edu:0 [ksh]
The procedure for remote displays between two machines not sharing the same home directory is more involved, since it is necessary to transfer the 'magic cookie' from one machine's .Xauthority file to the other's. This can be done relatively simply, however, if you can run a remote shell on the remote machine. Generally, for non-ARSC systems, this would require that you have an .rhosts file in your home directory on the remote machine with an entry consisting of your local machine name and userid. ARSC systems use kerberos for authentication and do not need .rhost files. Then to run an X Window application on chilkoot, and have it display on indigo43, for example, you would take the following steps:
on indigo43:
indigo43> xauth nextract - indigo43.arsc.edu:0 | /usr/local/krb5/bin/krsh chilkoot.arsc.edu '/usr/bin/X11/xauth nmerge -'
********************************************************************
alternatively, and more simply, you can use a local script (in
/usr/local/bin) developed to accomplish the above:
indigo43> exauth chilkoot.arsc.edu <your userid>
********************************************************************
indigo43> krlogin chilkoot
on chilkoot:
chilkoot> setenv DISPLAY indigo43.arsc.edu:0 [csh] or
chilkoot> export DISPLAY=indigo43.arsc.edu:0 [ksh]
To run an X Window application on a non-ARSC machine, and have it display on indigo43, for example, you would take the following steps:
on indigo43:
indigo43> xauth nextract - indigo43.arsc.edu:0 | /usr/bsd/rsh aurora.alaska.edu '/usr/bin/X11/xauth nmerge -'
indigo43> rlogin aurora.alaska.edu
on aurora:
aurora> setenv DISPLAY indigo43.arsc.edu:0 [csh] or
aurora> export DISPLAY=indigo43.arsc.edu:0 [ksh]
add the following line to your .cshrc file:
setenv PATH ${PATH}:/usr/bin/X11
then cause your change to take effect:
source .cshrc
add the following line to your .profile file:
export PATH=${PATH}:/usr/bin/X11
then cause your change to take effect:
. .profile
As in the previous case, it is necessary to transfer the magic cookie from one machine's .Xauthority file to the other's. Without the ability to open a remote shell on the remote machine, you will have to move the cookie over manually and merge it into the remote machine's .Xauthority file. To run an X Window application on video1 and have it display on grisly.cameron.edu, for example, you would take the following steps:
on grisly:
grisly> xauth [initiate xauth session]
xauth> nextract cookie grisly.cameron.edu:0 ['cookie' is arbitrary]
xauth> exit [terminate xauth session]
grisly> ftp video1.arsc.edu [initiate ftp session]
ftp> put cookie [transfer cookie file]
ftp> bye [terminate ftp session]
grisly> rm cookie [clean up]*
grisly> telnet video1.arsc.edu [initiate video1 session]
on video1:
video1> xauth [initiate xauth session]
xauth> nmerge cookie [put cookie in .Xauthority]
xauth> exit [terminate xauth session]
video1> rm cookie [clean up]*
video1> setenv DISPLAY grisly.cameron.edu:0 [csh] or
video1> export DISPLAY=grisly.cameron.edu:0 [ksh]
* Note that the cookie file contains all the information needed to access your X Window display. This is the reason why it should be deleted after use, or at a minimum checked to ensure that only you have read and write permissions for this file (octal 600).
add the following line to your .cshrc file:
setenv PATH ${PATH}:/usr/bin/X11
then cause your change to take effect:
source .cshrc
add the following line to your .profile file:
export PATH=${PATH}:/usr/bin/X11
then cause your change to take effect:
. .profile
Society
Groupthink : Two Party System as Polyarchy : Corruption of Regulators : Bureaucracies : Understanding Micromanagers and Control Freaks : Toxic Managers : Harvard Mafia : Diplomatic Communication : Surviving a Bad Performance Review : Insufficient Retirement Funds as Immanent Problem of Neoliberal Regime : PseudoScience : Who Rules America : Neoliberalism : The Iron Law of Oligarchy : Libertarian Philosophy
Quotes
War and Peace : Skeptical Finance : John Kenneth Galbraith :Talleyrand : Oscar Wilde : Otto Von Bismarck : Keynes : George Carlin : Skeptics : Propaganda : SE quotes : Language Design and Programming Quotes : Random IT-related quotes : Somerset Maugham : Marcus Aurelius : Kurt Vonnegut : Eric Hoffer : Winston Churchill : Napoleon Bonaparte : Ambrose Bierce : Bernard Shaw : Mark Twain Quotes
Bulletin:
Vol 25, No.12 (December, 2013) Rational Fools vs. Efficient Crooks The efficient markets hypothesis : Political Skeptic Bulletin, 2013 : Unemployment Bulletin, 2010 : Vol 23, No.10 (October, 2011) An observation about corporate security departments : Slightly Skeptical Euromaydan Chronicles, June 2014 : Greenspan legacy bulletin, 2008 : Vol 25, No.10 (October, 2013) Cryptolocker Trojan (Win32/Crilock.A) : Vol 25, No.08 (August, 2013) Cloud providers as intelligence collection hubs : Financial Humor Bulletin, 2010 : Inequality Bulletin, 2009 : Financial Humor Bulletin, 2008 : Copyleft Problems Bulletin, 2004 : Financial Humor Bulletin, 2011 : Energy Bulletin, 2010 : Malware Protection Bulletin, 2010 : Vol 26, No.1 (January, 2013) Object-Oriented Cult : Political Skeptic Bulletin, 2011 : Vol 23, No.11 (November, 2011) Softpanorama classification of sysadmin horror stories : Vol 25, No.05 (May, 2013) Corporate bullshit as a communication method : Vol 25, No.06 (June, 2013) A Note on the Relationship of Brooks Law and Conway Law
History:
Fifty glorious years (1950-2000): the triumph of the US computer engineering : Donald Knuth : TAoCP and its Influence of Computer Science : Richard Stallman : Linus Torvalds : Larry Wall : John K. Ousterhout : CTSS : Multix OS Unix History : Unix shell history : VI editor : History of pipes concept : Solaris : MS DOS : Programming Languages History : PL/1 : Simula 67 : C : History of GCC development : Scripting Languages : Perl history : OS History : Mail : DNS : SSH : CPU Instruction Sets : SPARC systems 1987-2006 : Norton Commander : Norton Utilities : Norton Ghost : Frontpage history : Malware Defense History : GNU Screen : OSS early history
Classic books:
The Peter Principle : Parkinson Law : 1984 : The Mythical Man-Month : How to Solve It by George Polya : The Art of Computer Programming : The Elements of Programming Style : The Unix Hater’s Handbook : The Jargon file : The True Believer : Programming Pearls : The Good Soldier Svejk : The Power Elite
Most popular humor pages:
Manifest of the Softpanorama IT Slacker Society : Ten Commandments of the IT Slackers Society : Computer Humor Collection : BSD Logo Story : The Cuckoo's Egg : IT Slang : C++ Humor : ARE YOU A BBS ADDICT? : The Perl Purity Test : Object oriented programmers of all nations : Financial Humor : Financial Humor Bulletin, 2008 : Financial Humor Bulletin, 2010 : The Most Comprehensive Collection of Editor-related Humor : Programming Language Humor : Goldman Sachs related humor : Greenspan humor : C Humor : Scripting Humor : Real Programmers Humor : Web Humor : GPL-related Humor : OFM Humor : Politically Incorrect Humor : IDS Humor : "Linux Sucks" Humor : Russian Musical Humor : Best Russian Programmer Humor : Microsoft plans to buy Catholic Church : Richard Stallman Related Humor : Admin Humor : Perl-related Humor : Linus Torvalds Related humor : PseudoScience Related Humor : Networking Humor : Shell Humor : Financial Humor Bulletin, 2011 : Financial Humor Bulletin, 2012 : Financial Humor Bulletin, 2013 : Java Humor : Software Engineering Humor : Sun Solaris Related Humor : Education Humor : IBM Humor : Assembler-related Humor : VIM Humor : Computer Viruses Humor : Bright tomorrow is rescheduled to a day after tomorrow : Classic Computer Humor
The Last but not Least Technology is dominated by two types of people: those who understand what they do not manage and those who manage what they do not understand ~Archibald Putt. Ph.D
Copyright © 1996-2021 by Softpanorama Society. www.softpanorama.org was initially created as a service to the (now defunct) UN Sustainable Development Networking Programme (SDNP) without any remuneration. This document is an industrial compilation designed and created exclusively for educational use and is distributed under the Softpanorama Content License. Original materials copyright belong to respective owners. Quotes are made for educational purposes only in compliance with the fair use doctrine.
FAIR USE NOTICE This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available to advance understanding of computer science, IT technology, economic, scientific, and social issues. We believe this constitutes a 'fair use' of any such copyrighted material as provided by section 107 of the US Copyright Law according to which such material can be distributed without profit exclusively for research and educational purposes.
This is a Spartan WHYFF (We Help You For Free) site written by people for whom English is not a native language. Grammar and spelling errors should be expected. The site contain some broken links as it develops like a living tree...
|
|
You can use PayPal to to buy a cup of coffee for authors of this site |
Disclaimer:
The statements, views and opinions presented on this web page are those of the author (or referenced source) and are not endorsed by, nor do they necessarily reflect, the opinions of the Softpanorama society. We do not warrant the correctness of the information provided or its fitness for any purpose. The site uses AdSense so you need to be aware of Google privacy policy. You you do not want to be tracked by Google please disable Javascript for this site. This site is perfectly usable without Javascript.
Last modified: March, 12, 2019
