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This chapter is a collection of Questions & Answers that
have been treated by the
Computing Help Desk (UCO) managed by the User Support
group.
Hannes Schwarzbauer IT/User Support
Answer - In the "CERN PC Virus Page" at URL:
http://pcvirus.web.cern.ch/pcvirus/
Answer - Normally, the Divisional PC representative is able to change an "Admin" password, provided (s)he is in the list of authorised accounts.
To see the list of authorised people, go from any NT account into:
start - system management - NICE NT domain administration - reset local administrator password - show authorised
If this isn't the case (there are indeed rare
exceptions), then
Nice.Support@cern.ch
should be contacted.
Remark: please make sure that you have really got NT installed. (This sounds obvious, but on one occasion it was discovered that this wasn't the case!)
Answer - From the control panel, choose:
- System - dev. manager - CDRom: click the + (plus) sign - Double click on the CD drive - settings - untick 'auto insert notification'and re-boot.
Nicole Crémel and Roger Woolnough IT/user Support
Answer - ROOT does not require local installation if AFS is available on your workstation. The details can be found from the ROOT home page
http://root.cern.ch -> "Status & Availability"Basically it is something like:
/afs/cern.ch/na49/library.4/ROOT/pro/hp700_ux102_aCC/root
Question - PArC Registration
How can I be registered to use the PArC engineering cluster on
RSPLUS ?
Answer - There is only a small group of
people able to do this registration. It is in effect the persons
responsible in IT/CE section as well as those in
User.Registration
. Therefore it is recommended for users
requesting accounts to send a mail to
User.Registration@cern.ch
where they can be quickly
registered.
Answer - Obviously you must compile
your program on both platforms and produce two executable modules,
one for DEC, one for IBM. Then, to be able to run the same command
on different platforms, we introduced at CERN a system variable
called @sys
. On every system this is set to
the local UNIX name. E.g. on RSPLUS and RSBATCH it is defined as
rs_aix41
. On the PArC IBM node it is
rs_aix41
and on the PArC DEC nodes it is set to
alpha_dux40
. However, we have made a directory
bin
in every home directory which is a link to
@sys/bin
and all you need to do is put executables into your
bin
directory on a given machine.
So, on an RSPLUS node create (compile and link) your program
and put the executable in bin
and do the same on a
DXPLUS node (DXPLUS are DEC Alphas) or create the executable in a
batch job that you submit to a DEC node. Then you just
execute
$HOME/bin/your_programon any machine (can be in a batch job) and it automatically finds the right version (usually this
bin
directory
is in your "search path").
N.B. In case the setting for such a bin
directory
(link to @sys/bin
) is not correct for your login, then
you can use the command "uco -home"
to reset
the structure of your Home directory (type "man uco"
for more details).
Answer - This problem is probably due to the (annoying) fact that HP passwords disallow a few characters which AFS passwords allow (e.g. #). The "passwd" program authenticates directly to AFS from a logged-in session, but when you next log in the HP login program first gets to read your password before passing it on to the AFS authentication, and refuses some characters. When this happens you should contact the Computing Help Desk (78888) who can provide a new password for you. Please then avoid using special characters like #!
Note there is a detailed section regarding "Passwords" (and "How can I choose a good password?") in the document CERN Security Handbook at URL:
http://consult.cern.ch/writeup/security/main.html
Answer - The command
"madbatch"
is part of the PArC environment. If you have not
set this up (you must execute the command "parc_apps"
once to add it to your path) you will not see it. What it does is
submit single MAD jobs to PArC batch.
However, note that this is not enough for users who set multiple MAD runs which pass data between them via the EPIO package.
You can run your jobs on PArC nodes by just changing the queue names. Instead of
bsub -q 1nd track.scruse
bsub -q e-1nd track.scrThe
e
in the queue name means an engineering
node.
Now, there is a complication. There are about 9 machines
that run the e- batch queues, 8 are DEC alphas and 1 is an IBM like
the current RSBATCH machines you are using. Another 2 IBM machines
will be added next week. The bsub
command
above will go to any machine.
Either you must restrict usage to one of these two UNIXes or you must
build executables for each machine and put these files in the
corresponding bin
(link to @sys/bin
) on a
given machine.
N.B. If you want to restrict usage to the DEC machines you need
bsub -q e-1nd -R type=Digital-UNIX track.scrand to restrict usage to the IBM machines you need
bsub -q e-1nd -R type=IBMAIX4 track.scrMAD works on both and
"madbatch"
allows to
execute on either.
It is, unfortunately, not possible to submit to the e-1nd queue from a DXPLUS machine but you can just have a window there to make the executables then submit from an RSPLUS window.
Note that there are more DEC than IBM in the PArC cluster, and each one is faster, so it is probably worth making a DEC version. Your job will run as it is now if you use :
bsub -q e-1nd -R type=IBMAIX4 track.scrbut you will probably not be able to run as many as you want.
Question - PCSF Service
Where can I get information about the PCSF service?
Answer - PCSF is the Pentium Central Simulation Facility. It provides batch processing resources based on LSF and Windows NT technology. You can get more information in the "PCSF" Web page, at URL:
http://wwwinfo.cern.ch/pdp/pc/Services/PCSF/Welcome.htmlFor PCSF matters or problems you can also send messages to the mailing list
pcsf-support@listbox
.
Answer - It is possible to set accounts
with privilege to modify the ACLs of any user. You must send such a
request to the Help Desk (Helpdesk@cern.ch
,
78888).
Andreas Wagner IT/User Support
Question - Include file in an
HTML document
How do I include a file in an HTML document ?
Answer - The Apache Web-Server supports so called "Server Side Includes" (SSI). Here is how to use it:
In the directory in which
the file(s) are located add/create a file
.htaccess
containing (at
least):
Options +Includes AddHandler server-parsed .shtml AddType text/html shtml
This assumes that documents containing the includes have the extension '.shtml'. Here is a simple example file using SSI:
<html> <head> </head> <body> Last modified: <b><!--#echo var="LAST_MODIFIED" --></b> <hr> <!--#include file="test-incl" --> <hr> </body> </html>
The statement "<!--#include file="test-incl" -->" will include the file named "test-incl".
For further information see also the article about SSI in ApacheWeek, i.e.: http://www.apacheweek.com/features/ssi and the Apache documentation (FAQ): http://www.apache.org/docs/misc/FAQ.html#ssi-part-i
Answer - Use the package "pifont", e.g:
\documentclass{article} \usepackage{pifont} \begin{document} \ding{43} \end{document}
The argument of the \ding
command is the decimal number of
the character in the ZapfDingbats
font. In
the attached tables (Table 7.1 and
Table 7.2) you can see these
characters codes.
Similarly, you can use the characters in the Symbol
font.
For the latter table you can write \Pisymbol{psy}{167}
and obtain the character expected.
Question - EURO Symbol in
LaTeX
Is the EURO symbol available in LaTeX?
Answer - There are several
packages providing the euro symbol for LaTeX. Installed at CERN is
the package textcomp
, e.g.
\documentclass{article} \usepackage{textcomp} \begin{document} \texteuro \end{document}
See also CNL 232, page 19, or the URL:
http://consult.cern.ch/cnl/232/art_tex.html
Collected by the IT/User Support Team
Answer - "Listbox" is a central service provided by IT Division in order to operate and manage "public" mailing lists (as opposed to the private ones built in personal addressbooks).
"MOWGLI" is the acronym chosen to baptize the Web interface used by users to deal with those lists.
There are several advantages to this approach, some of which may be attractive to you:
http://consult.cern.ch/service/mail/advanced/listbox/
Answer - In the context of our LCB Videoconferencing Project, we have set up the Virtual Room Videoconference System (VRVS). This system provides a Web-based user interface, and uses the well-known vic/rat audio/video public domain applications that are supported by Windows and most Unix versions.
The VRVS URL is
http://vrvs.cern.ch/
. Documentation is available
on-line.
Please note that a VRVS redistribution node (called a
reflector'') is already installed at RAL. Among others, Steve
Fisher (s.m.fisher@rl.ac.uk
)
and Rob Edgecock (rob.edgecock@rl.ac.uk
)
have been using the system at RAL.
Concerning hardware, the video card we have been running
with vic is Win/TV by Hauppauge Inc. (see
http://www.hauppauge.com
) which cost about 180 CHF. Any
video camera with a video composite or s-video connector can be
connected to the Win/TV card. Please note that a video card is
useful for sending video. Receiving video requires no special
hardware. For audio, a Sound-blaster compatible card is Ok. A
comfortable PC is a 300 MHz Pentium II with 64 MB RAM and at least
4 MB on the Graphics card.
Answer - As announced in different newsgroups, access to Web-servers (port 80) from outside CERN is now blocked by default for all Web servers that have not been registered with the Web Office.
If you find that access to your Web-server is blocked, and you have already registered, or urgently need to register, please contact John Gamble.
If you wish you may verify the registration by following these instructions.
1) Browse http://network.cern.ch/register 2) Follow the link "View the registered information about a device" 3) Fill in the "host name", then click on SEARCHThis will normally present you with a page of information concerning the host name entered. On the line "External TCP/IP connectivity: " you will see indications such as OUTGOING or INCOMING and then, if this host is an external Web-server, you will see the text "and EXTERNAL_WEB_SERVER". For example:
External TCP/IP connectivity: OUTGOING and EXTERNAL_WEB_SERVERYou may register a Web-server at any time by printing out and filling in the form at:-
http://www.cern.ch/WebOffice/Registration/send it to your Divisional Webmaster who will forward it to the Web Office. Your server will then become one of those that will be visible from outside CERN. Please allow time for this to happen.
Answer - The Software Development Tools Service provide access to the SNiFF+ programming environment (commercial tool) for Java, C, C++ and Fortran, and it seems to be very successful.
For more information on SNiFF see:
http://www.takefive.com/sniff/
For more information on the "Software Development Tools
Service" see the Web
(URL=http://www.cern.ch/PTTOOLS/
).
For matters related to this article please contact the author.