or any other computer running Unix, for that matter. Turning these computers off without executing the proper shutdown procedure can cause damage to everyone's files, including your own. Additionally, other people may be using the computer remotely at the same time you are using it, and turning the machine off is sure to anger those people. If you are ever tempted to turn one of these computers off, read the section titled When You Encounter Problems below. If that doesn't help, please submit a Help Desk Ticket Request at ITS. If no help is available, simply leave the computer alone and use a different one if necessary. Report the problem using the form listed above as soon as possible.
IMPORTANT: When you finish using one of the Suns, be sure to log out (see the section titled Logging Out below). Otherwise, anyone can sit down at the computer you just left and access and modify your files, send harrassing email as you, and so on.Unless reserved for a class or seminar, the Sun Lab is available as long as the Olmsted Building is open to individuals having a valid access to Sun Labs (available via your PSU Id card which must be activated by the staff assistant) and an account on Sub Lab machines.
The machines are on 24 hours a day and available for console and remote access, with the exception of the duration for the maintenance of the machines. The maintenance of the machines is normally performed late Sunday morning to early Sunday afternoon. You should plan your work accordingly. The machines may not be available for other reasons, such as power outages, hardware or software failures, etc. If the reason the machine(s) will be unavailable is known ahead of time (with the exception of the regular maintenance), an email will be sent to the mailing list.
Before you start using Sun Lab machines, make sure you read and understand the policy on acceptable uses of these machines.
To log in to Sun Lab machines, you will need a valid Sun Lab account. This account is different from your PSU Access account. You may request a Sun Lab account by filling out a form from Computer Science program at W255 Olmsted. Once you have a valid account, you can log in to any of the machines in Sun Labs with your account credentials. Note that the password will be the same password that you use to access other PSU systems.
To log out, you can click the button on the far-right of the top menu bar and select "Log Out...". Make sure that you save your work and close all open windows before you log out.
If you are logged in remotely via ssh, simpy type
logoutor hit ^D (otherwise known as control-D). Return to Table of Contents
When you log in, you will be greeted by the desktop environment called Unity. At startup, Unity will present you with a Top Menubar (the horizontal bar on top of your screen) and a Launcher (the vertical bar on the left of your screen). Since Unity is your interface to the machine, how comfortable you are with Unity determines how effective you are in using the machines.
If you are new to Unity, you are strongly recommended to watch Ubuntu Unity Overview by Alan Pope at Canonical. If you prefer to read, read this introduction. More in-depth introduction to Unity include:
Return to Table of ContentsTo open a shell from the desktop environment:
Five text editors are available to you:
emacs and vim have the built-in tutorials you can follow. To access emacs tutorial, open an emacs window by executing the command:
emacs&and type Ctrl-h t (that is control key and h at the same time, followed by t) inside the emacs window. For vim tutorial, execute the following command:
vimtutorReturn to Table of Contents
All of the following discussion applies whether you are accessing these computers via ssh or are actually sitting at one of the Sun Lab machines.
Most importantly, NEVER print an executable file -- that is, an a.out file or any other file produced by compiling a program. This files are extremely large and contain no intelligible information when printed.
To print a postscript file or text to one of the B/W laser printers in the lab, enter the command:
lp filename
where filename is the name of the file you want to print. A
postscript file will usually have a .ps extension. Many
applications (notably web browsers and Adobe Acrobat) produce/print postscript
files. You should not have to change anything in the default configuration of
these applications to print correctly.
You can also convert a text file to a postscript file and then print it using the enscript command. This allows you to format a text file nicely. For example, the following:
enscript -fCourier8 -2rG filename
will print the text file filename in an 8 point Courier font (-fCourier8), two columns (-2), landscape (-r), gaudy mode (filename, date, etc... at top of page) (-G) to the printer as a Postscript file.
If you change your mind about printing a particular file, use the command:
lpstat -a
to get a listing of all pending print jobs, and then the command:
cancel pid
where pid is your print job id number.
If the job has already started to print,
you need to cancel your job at the printer by pressing the orange cancel button.
All of the Sun Lab machines can be accessed via ssh and
sftp. To access the machines from outside of the Penn State campus, you will need to install and run the Virtual Private Network (VPN), which is
availabe for download at the PSU ITS webpage.
In addition, you will need a secure shell (shh) client. Macs and Linux systems come with ssh installed. Examples of ssh clients for Windows include
PuTTY and
MobaXterm.
These clients are useful for working from a remote location, or for those times
when all seats at the Sun Lab are in use. The PCs
in the campus labs have ssh installed. Select the Start menu, then Programs,
and then (probably) security (ITS changes the folders periodically).
Any of the following Sun Lab machine names can be used.
If you are sitting at a computer and need to leave for less than five minutes,
it is acceptable to secure your account by locking the computer. This is
done in one of the following ways:
Access via SSH and SFTP
alpha lab:
courant.hbg.psu.edu
dijkstra.hbg.psu.edu
galois.hbg.psu.edu
hardy.hbg.psu.edu
noyce.hbg.psu.edu
nygaard.hbg.psu.edu
perlis.hbg.psu.edu
shannon.hbg.psu.edu
ulam.hbg.psu.edu
wilkinson.hbg.psu.edu
zeno.hbg.psu.edu
zorn.hbg.psu.edu
beta lab:
ada.hbg.psu.edu
alonzo.hbg.psu.edu
babbage.hbg.psu.edu
borg.hbg.psu.edu
cantor.hbg.psu.edu
cray.hbg.psu.edu
dahl.hbg.psu.edu
eckert.hbg.psu.edu
erdos.hbg.psu.edu
euclid.hbg.psu.edu
euler.hbg.psu.edu
fermat.hbg.psu.edu
fourier.hbg.psu.edu
frege.hbg.psu.edu
gauss.hbg.psu.edu
godel.hbg.psu.edu
grace.hbg.psu.edu
hamming.hbg.psu.edu
hilbert.hbg.psu.edu
noether.hbg.psu.edu
pascal.hbg.psu.edu
peano.hbg.psu.edu
riemann.hbg.psu.edu
wilkes.hbg.psu.edu
zermelo.hbg.psu.edu
As some of these computers will be out of service at times, try several
before concluding that none are accessible.
Locking a Computer
After you execute one of the above commands, a screen saver will appear on
the monitor. When you return, remove the lock by pressing Return
and then entering your password.
If locking a computer becomes problematic (i.e. if computers are consistently locked for long periods of time), the locking feature will be removed. System administrators reserve the right to remove a lock and log the user out whenever necessary.
Return to Table of ContentsThe following discussion of man and info applies whether you are accessing these computers via ssh or are actually sitting at one of the Sun Lab machines.
If you know the name of the command you need more information on, enter:
man command-name
Some commands will also have additional information available in the form
of info documentation. This can be accessed by entering:
info command-name
If no info documentation is available, then info
will display
the relevant man pages, so always using info is a
good strategy. To see the tutorial on using info, enter:
infoand then hit h to bring up help on info.
If you want to see a list of commands relating to a particular topic, enter:
man -k topic
When all other sources of help fail, submit a help request form at ITS.
NOTE: Do not bother him with questions related to your classes and/or assignment. He would not
answer such questions.
Remember that turning the power off and on never helps when a program locks your screen or some other mishap occurs. All that turning the computer off will accomplish is annoying anyone else who was using it and (likely) damaging the file system. Please read the following before asking for help.
If a power surge occurs while you are sitting at one of the machines and it loses power, it will often be able to restart itself when power returns. This process can take as long as five minutes or more, so be patient. Eventually, the login window should reappear so that you can log back in and continue working. If the computer can not restart itself, submit a help request form at ITS for assistance. You will be logged out when a power surge occurs, and so your account is secure even if help is not available.
If you are logged in via ssh and a power surge occurs, your connection will be broken. You won't be able to ssh back in until the computer has restarted, which can take five minutes or more as noted above.
The following discussion applies whether you are accessing these computers via ssh or are actually sitting at one of the Sun Lab machines, except that you may not have to use a separate ssh session if you are sitting at one of the Sun Lab machines.
If a program you are using crashes, you may get an error message like:
segmentation fault, core dumpedIn that case, just remove the core file from the directory you ran the program in (unless you need it for debugging):
rm coreand then continue with whatever you are doing.
If a program you are using locks up a window or your entire screen, do the following:
| Math/Computer Sciences Home Page |