Software (Local Access Only)
Frequently Asked Questions
Frequently Asked Questions (FAQ)
- How do I get help?
- How do I get an Account? For a visitor?
- How do I login? What are my options?
- How do I logout? How often should I logout?
- What can I do about SPAM and how can I protect myself from suspicous/malevolent emails
- How do I reboot? Should I reboot?
- What is backed up and how often? How do I restore a file?
- How much disk space can I use?
- How do I print from Linux?
- How I setup a personal/class webpage? How do I change information on my Departmental Webpage?
- Where are the public printers?
- What classrooms have computers and how do I use them?
- Do we have a scanner and how do I use it?
- How do I use a Floppy (or CDROM) under Unix
- Where should I run large computational jobs? Do we have a cluster?
- What is a command prompt and how do I get one?
- How do I read my e-mail?
- How do I change my password?
- How do I set my default printer?
- What program do I use to do ... ?
- How do I burn a CD-ROM?
Advanced Software Questions
- Where can I find documentation on Latex (TeTeX)?
- How do I create a PDF file from a Postscript or DVI file?
- How can I use graphics with pdflatex?
- How do I Move, Copy, or Delete a File from the Command Line?
- How can I post password protected web pages and files?
- How do I allow certain users access to my files? What are ACLs?
- How can I use PGP with Pine?
Home Computers and Laptops
- How do I access my account remotely?
- How can I use VNC for remote sessions?
- Can you install linux on my home computer/laptop? Can you fix my home computer/laptop?
- Can I print from my laptop via the wireless network?
- How can I mount my home directory from my home Linux machine?
- How can I mount my home directory from my home Windows or MacOSX machine?
How do I get Help? Who do I call?
The best, fastest, and most efficient way to get help is to mail firstname.lastname@example.org with a description of your problem. This will send your message to all our systems administrators and allow them to respond from where ever they may be at the time. Email is by far the best way to reach us. You should receive an automated confirmation message letting you know the email was received by the system
Calling your Systems Administrator should be reserved for emergency situations.
An Emergency is defined as when you are unable to Email.
We ask that you do this for a couple of reasons. First is that we are frequently juggling several tasks and a phone call essentially disrupts this process and forces us to address your questions immediately without time to think about it. You will get better, more complete, and more polite answers we are not interrupted regularly. If a more involved discussion is required, we can make an appointment and meet with you or arrange a call to work on the problem. The second reason is that it establishes a record of problems that we have worked on and solutions we have devised. There is nothing more frustrating than to have a user call with an unusual problem, which we work on solving and answering after recommending they use email, only to have another user encounter a simliar problem months later and we can't remember how we solved it the first time. Email creates a nice paper trail, especially for the administrator that didn't work on the problem the first time.
Finally, we are often not at our desks, but can get to email virtually anywhere. When possible, we answer your email as soon as we get it. We try to stay on top of problems and solve them as priority will dictate.
How do I get an Account? For a visitor?
Account applications are made online at https://www.math.duke.edu/cgi-bin/account. All regular members of the Mathematics Department (undergraduate major, graduate student, postdoc, faculty, or staff) are eligible. If an account is required for a visitor or someone who is not a regular member of the Mathematics Department, either apply online or have them apply online and be sure to include the name of a faculty sponsor and/or the number of a Mathematics Class for verification. We reserve the right to refuse any application.
How do I login? What are my options?
Logins are done through a graphical screen with fields for Username and Password. If the computer is at a text screen with a Login:prompt, then it is not ready for use. Try pressing ALT-F1 to see if the usual graphical screen comes up. If not, try another computer and email email@example.com we can fix the problem.
To login, enter your username, press Tab to switch to the password field, then enter your password. Asterisks (*) will appear as you type your password so that others cannot read it. To login with the default environment, press Enter after entering your password. You can select the environment to login with by choosing from the Menu:button and then from the Session Typemenu. The most common selections are GNOMEand KDE although there are several other, less functional but also faster, desktop environments available.
How do I logout? How often should I logout?
Logging out is dependent upon the desktop environment you are currently using. If you are using the default, the KDEenvironment, right click on the desktop and select Log Out <Username> or click on the menu icon (usually a Red Hat on the left side of the task bar) and select Log out... You will be asked to confirm your decision. If you are using Gnome, select the Desktopmenu
from the top bar and then choose Log out.
In a pinch, if applications have locked up or the logout process is having problems, press the keys Control-Alt-Backspace at the same time. This will do a forceful logout.
WARNING : Data from applications that are open will not be saved and no confirmation will be given. Use carefully.
How often should you logout? Logging out frees memory from applications and generally cleans out things. If things seem to be running slower than usual, logging out and back in might be the easiest way to return to normal. As a general rule of thumb, if you have a computer for personal use on your desk and you are going to be away for more than one day, it would be good to logout (such as a weekend). If you are using a public computer, such as one in the labs or a common computer in a graduate office, and are going to be away for more than one hour, you should logout to allow others to use the computer while you are gone. Another reason to logout is that we are constantly performing updates on systems in the department. On rare occasions, a reboot is required. Fortunately these are much rarer than on Windows. We try to arrange reboots around times when people are not logged in, but there are always a few users who do not logout for months and special attention is required to arrange a time to reboot their machine. Logging out when you are out of the office for a couple of days gives us the chance to reboot with disrupting your schedule or our schedule.
is a command prompt and how do I get one?
prompt is a text based application that provides direct interaction
with the Unix system. It
is similar in context to MSDOS or the Command Prompt window you can
bring up on Windows systems. A listing of
basic commands with documentation is available at
general, most things can be done through the graphical
user interface. But sometimes we will ask you, or it may be quicker and
easier, to use the command prompt.
If you are using the KDE environment (the default),
the command prompt can be found in the RedHat menu under System
Toolsand is called Konsole. If you are
using one of the other environments, ask us if you cannot find
how to bring up a command prompt. As a shortcut, you can also press ALT-F2
which brings up a Run
box. You can enter any command here that you would enter at the command
prompt and it will execute directly.
From the command prompt, you can execute almost all
programs by just typing the program name, sometimes with an
argument such as a file to edit or display. For example, you can run
the following programs by typing their command
There are many more programs available than are
possible to list. If
you are looking for something specific, email firstname.lastname@example.org
and ask, we'll be glad to help.
do I read my e-mail?
There are many
applications available for reading email and fortunately, most are
each other and can be used interchangably. The recommended mail client is Thunderbird in the K Menu under Internet (or
from the command line, thunderbird).
You can pre-configure Thunderbird by running the program thunderbird_setup
from the command line to configure it properly
for IMAP mail access. Other programs available, but not supported
include evolution, kmail, and balsa.
From the command
line, we recommend pinebut mutt
and mailare still available if needed.
Finally, from the
Web you can access your email securely via
Horde WebMailor TWIG.
do I change my password?
your password, bring up a command prompt console (in KDE it is under
the RedHat icon, System Tools,
then select konsole) and execute the command passwd.
After entering your current password once,
you will be prompted for a new password twice, then your password
should be changed.
do I set my default printer?
You may select one of
the public printers or a private printer (with the proper permission)
as your default
printer. Then any jobs send to a printer without specifying which
printer, will go to your default printer.
To specify a default printer, you first need to know which shell is
your default. Run the command echo $SHELL
from a command prompt. It should return one of the following :
You then need to add a line to
a file in your home directory that the shell uses when you login.
For the C Shells/bin/csh and /bin/tcsh
you edit the file called .cshrcin your home
directory. (If you are un sure how to do so, try the command gedit
~/.cshrcfrom the commandline). Add the following line to the
end of the file :
setenv PRINTER lw0
where lw0is an example of one of the public
printers. For the Bash Shell/bin/bash
you edit a file called .bashrcin your home
you can use gedit ~/.bashrcto edit this file from
the commandline. In this file you add the following line
at the end :
where lw0is an example of one of the public
You will need to logout and login again for this change to take effect.
much disk space can I use?
Short Answer: New users have a home directory quota of 20GB. There is
no quota for local disk space in /xtmp or /ytmp.
Long Answer: In the last couple of years, the amount of disk space
required has doubled about once a year. While disk space is relatively
cheap, backup space (which is an absolute necessity) is not.
Thus our first step in this process is to try to eliminate from our backups
all files that really should not be backed up to offline storage. This
includes all personal MOVIES, MUSIC, PICTURES (those not intended for
web distribution on your personal page), and other such files.
We have three categories of disk space available to you (listed in order of
cost of resources, highest first) :
A) Home Directory Space (~username)
* Backed up nightly
* Available simultaneously from all machines
* Not as fast
B) Workstation Local Disk (/xtmp)
* Backed up nightly
* Available only from local machine (or via ssh connection)
C) Workstation Local Disk (/ytmp) :
* NOT Backed up
* Available only from local machine (or via ssh connection)
The /ytmp directory was created to accomodate the large amount of personal
files that are being created on our systems that have no business being backed
up nightly (or at all for that matter). If you need to have games, MP3 music,
RM, AVI, MPG, DIVX, or any other personal material on your office machine,
PLEASE PLEASE PLEASE put these files in /ytmp so that they will not consume
public disk space or backup resources.
A general rule of thumb is that email, papers you are working on, and code you
are writing that needs to run on several computers should be placed in your
home directory. Large files, data sets from code runs, archived documents,
and anything else that needs to be backed up should go to /xtmp. All other
files should be placed on /ytmp.
is backed up and how often? How do I restore a file?
For a summary of what
is backed up, refer to the FAQ on Disk Usage.
Backups are done nightly at 1:30am, although due to the volume of data
backed up may not complete
until after 3:00am or later. We archive monthly backups for up to 1
year and yearly backups perpetually.
If you delete a file, or worse, many files, email
email@example.com with a listing of what you
need recovered and the approximate date of when you want the data
recovered from. We will restore
the files, possibly in a separate directory, and notify you when the
data is available.
program do I use to do ... ?
Linux is a very
capable operating system that has many applications, several of which
functions but have a wide range of different/missing/extra features.
Here are a few applications that
are use for common tasks with their names for use from the command
line. Most of the programs are also
found in the KDE and Gnome menus under the appropriate headings.
Office Files (.doc, .xls, .ppt): These files can be edited
and created most easily
with OpenOffice, run sofficefrom the command
prompt. Alternatively, the programs abiword
and gnumericcan handle Word and Excel files
respectively, and may be faster than OpenOffice, but
may be more or less compatible depending on the features of the files.
TeX (.tex, .dvi): For editing TeX files, try kile
or kwrite. They have
context sensitive highlighting and other features to make editing TeX
files much easier. Viewing .dvi
files can be done with xdvior kdvi
which both provide methods of zooming and printing.
(.pdf): The default application for PDF files is Adobe's acroread.
other applications exist which may be used if problems arise with
acroread. They are evinceand xpdf.
Acroread is probably faster and
is endorsed by Adobe, but there are documentst that
cause it to have problems, here evince and xpdf may work better.
Audio Files/OGG Audio Files (.mp3, .ogg): Music files can be
played from programs such
as amarok, xmms, rhythmbox,
gstreamer, and even the command line
mpg123and ogg123. Be sure to check your
volumes with mixers such as kamixor from the
command line, alsamixer.
Audio/Video Files: For other audio/video files, try playing
them in totemor kplayer.
do I scan a document into my account?
There are two ways
available to scan documents into your account.
Alternatively, there is a scanner hooked up to the
Windows XP machine
in room 102 that can be used.
Instructions for this scanner are available here
as well as posted above the computer attached to the scanner.
do I burn a CD-ROM?
To burn a CD,
first check if your machine has a CD drive capable of writing to discs.
Stenciled on the front of
the drive door should be a logo proclaiming either Compact
Discor Compact Disc Rewritable. If you
have a drive with the latter (Rewritable), then you can burn CDs on
this machine. Run the program k3b. It
should be self explanatory from the menus and prompts, but in short,
you tell it to create a new Data CD, drag
the files/directories you want to burn to the bottom area, then hit the
"Burn" button after inserting a black
CD-R in to the disc drive.
The command line
programs mkisofsand cdrecord
are also available for advanced users.
do I reboot? Should I reboot?
rarely need rebooting. Several machines in the department have been up
and running, and in use,
for over 200 days at a time. Occasionally we will need to reboot the
machines to install security updates or
to perform hardware upgrades. However, one thing to keep in mind is
that you are not necessarily the only
user using the machine when you are thinking about rebooting. Even it
is your personal office machines,
administrative scripts may be upgrading software packages, running
scans, or managing maintenance tasks. Thus it is preferable to only
reboot when absolutely necessary.
If you machine
appears to lock up, the first thing to take note of is whether the
mouse cursor can still move.
If so, the machine is not totally locked up, only the graphical
interface. And it may be waiting on some
application that is causing the machine to appear hung. First, give the
machine about 1 minute to see if
it recovers. Restarting file servers, which happens rarely, but does
happen, can cause machines to hang
for about a minute while the server reboots. After that minute or so,
consider whether you really need to recover control and get back to
your programs that are running or if logging out is a sufficient
alternative. Pressing CTRL-ALT-BACKSPACE should kill the graphical
session, log you out, and allow you to login again.
If that fails, you can try contacting us by phone and then hit the
reset button to reboot the machine.
If you want to try regaining control, you can remotely login to your
machine via ssh from another machine,
and if you gain access, kill off processes one at a time until you
regain control or it becomes clear
a logout is the only solution. You can contact us to take a look at a
machine remotely to help you kill
If the mouse no
longer moves, it is very likely the machine is totally hung. It would
be preferable to check CTRL-ALT-BACKSPACE and possibly try logging in
remotely via ssh to verify the machine is inaccessible,
but after, rebooting is your only option.
NOTE :If you machine crashes regularly, that is a good
indication of either a major
hardware problem or a bad software issue and we should attempt to
correct it. It is difficult for us to
know the difference between a reboot caused by tripping over a power
cord and one caused by a machine
locking up. So if you are having consistent problems with a machine,
let us know so we can take a more
do I access my account remotely?
several ways to access your account remotely. The simplest way is
through the command line interface
provided via ssh. There are SSH clients available
for Mac OSX, Windows, and Linux that will allow
you to access a command prompt for almost any machine in the
department. From the command prompt, you can run
any text-based applications, and with a fast enough connection and a X
server capable local machine, even run
graphical applications remotely.
The second way
is via the web. The suite of programs at
https://www.math.duke.edu/secure/hordeprovides you with
access to email, files, mail forwarding, vacation
message management, a web proxy (coming soon), and SSH access.
Finally, the third way is via VNC. All systems
should have VNC servers running on the primary X display
which allow the owner of the console to access the display remotely. To
do so, first create a vnc password
by running vncpasswdat the prompt and entering a
password twice. Now you should be able to
connect to a screen by using a VNC client to connection to machinename:0
and entering that password.
Note that you must be logged in on the system to use this method,
otherwise root will own the console and
you cannot connect. This connection can be slow and have problems, like
multiple keystrokes registered
for single keystrokes (run xset r offto fix and
the xset r onwhen you are done, this
disables/enables key repeat when you hold it down).
Since our department employs a firewall that blocks
VNC, to use it from outside the department you need to
tunnel your VNC connection over SSH. From unix, this is easy with
RealVNC via the command vncviewer -via
firstname.lastname@example.org machine:0which will create an
as user usernameto computer machine.math.duke.edu
and after asking for your SSH password,
create the tunnel and ask for your vnc password to complete the
connection. From Windows and MacOSX machines, you
need to establish an SSH forward from local port 5910 to the remote
machine you are connecting to port 5900
and then connect your VNC client to host localhost:10.
Detailed instructions are dependant on the
SSH client used to connect to the department.
can I use VNC for remote sessions?
VNC is a remote display protocol that works well over slower connections. It will
let you run graphical programs such as Matlab and Maple remotely in a virtual session.
In addition, this session will continue to run until explicitly terminated. You use
a VNC viewer to connect to the session and control it but you can disconnect at
any time and return later.
First, connect via SSH to the machine you want to run your VNC session
Connecting from Linux
on, cauchy.math.duke.edu would work or you can use the machine in your office
if you have one.
Once logged in, run :
vncserver -geometry XxY
where XxY is the resolution of the virtual screen you want to create,
800x600 or 1024x768 are good choices. The larger it is, the slower,
but over Duke LAN connections, it doesn't make too much difference.
When you run this command, it will return the screen ID to you,
something like cauchy:5. Remember this. This screen (cauchy:5) will continue
running until you expicitly kill it or the machine reboots so you can keep
connecting and using it. Just closing the VNC viewing window will not
kill the session.
Now set your VNC password by typing :
and entering a password twice. You only need to do this once, after
that, the vnc password will be set for all future sessions.
Thats the setup part, now to connect to your screen whenever you want to
Connecting from Windows
do some work, you need a VNC viewer with SSH capability.
If you are running linux on your machine, you can try connecting with
the command :
vncviewer -via username@remotehost remotehost:display
which following our example above would be something like (replacing joe_user with your username):
vncviewer -via email@example.com cauchy:5
This will ask for your SSH password first, then your VNC password.
The simplest way to connect to your VNC connection is by going to the link :
Closing the connection
SSH/VNC Java WebStart.
This application does require that Java WebStart is installed on your system.
This website can help you install Java WebStart if it is not already installed :
Install Java WebStart by Elluminate
When it has loaded, tell it to "Create a New
Connection" under the file menu, and connect to :
hostname : (whatever host you setup the vnc server on)
post : 22
username : Your Username
Then go to the VNC settings TAB and select "Linux/Unix Variant", leave
Host as "localhost" and set the Display value to the number of the screen ID
(in the example way up above, it was 5).
Then hit connect. Enter your Unix password for the first prompt, then your
VNC password for the second one.
Alternate Windows Connection
The Java based method has some disadvantages, no fullscreen support, some keys are not supported, etc.
An alternate way that will provide fullscreen support as well as enhanced speed is to install the SSVNC viewer, available here :
SSVNC: SSL/SSH VNC viewer
Tell it to use SSH for the connection, use cauchy.math.duke.edu as the proxy/gateway, and connect to your VNC session you set up in the initial setup, in this example cauchy:5.
Just close the window when you are done and you can reconnect anytime later
and resume your session.
To really kill the VNC session, logout of the Panel and it will close the VNC
should I run large computational jobs? Do we have a cluster?
We do have a cluster of machines running Sun's Grid Engine software to
manage jobs. The machine grid1.math.duke.edu
through grid16.math.duke.eduare available for
running long computational jobs, but it is preferable to submit these
jobs through the Sun Grid Engine (SGE) interface on grid.math.duke.edu
so that resources are utilized with maximum efficiency. Read the
documentation for submitting and monitoring jobs at http://www.math.duke.edu/computing/sge_howto.html
you install linux on my home computer/laptop? Can you fix my home
We are available to assist you with your home computers and laptops,
however keep in mind that our primary
jobs are maintaining the 140 or so computers in the department and
supporting the 100 or so regular users
so our assistance will be strictly as time permits. Contact us in
advance to discuss what needs to be done
and to schedule a time when we can work on your machines.
We can install linux on your computer with the exact same setup as the
ones in the office (with the exception
of Matlab for which you will need to purchase a license) and can even
install it alongside an existing Windows
installation. You will need at least 10GB of free disk space for linux.
A typical install will take about
3 hours for a clean install, 5 hours for an installation along side
Windows, or about 5 hours for an upgrade
(since we have to backup your old data first, then install, then
restore your data). As you can see it can
be rather time consuming so if you are bringing by your computer, be
sure to get it here in the morning (before
10am) if you expect it back by the end of the day.
I setup a personal/class webpage? How do I change information on my
Creating Personal/Class Webpages
You can set up personal or class webpages inside your home directory
within a subdirectory called public_html.
All files and directories placed in this subdirectory will, with proper
permissions, be accessible via the web at
http://www.math.duke.edu/~username/ where username is your login name.
If you omit the filename, as in this example, the file index.html will
be displayed if present or an error given if it is not present.
To setup a personal
webpage, here are the basic steps. Run these from a command prompt :
Dynamically Generated Departmental Webpage
We have created a Faculty Database system that is designed to be a
central respository of all information
related to your employment with the Duke Mathematics Department.
Through the web interface at http://fds.duke.edu/db/aas/Math
you can enter
all sorts of information such as :
All of this information can be optionally included in a dynamically
generated web page that is created
to give a uniform look to all official web pages of members of the
Mathematics Department. You can view
the current state of your webpage by following the appropriate links
from the main web page at http://www.math.duke.edu.
the front office staff if your name is not listed or listed in the
- Contact Information
- Picture of Yourself
- Research Interests
- Classes you are teaching
- Students you are mentoring
- Papers published
- Committees and other Activites
- Links to Personal Pages
- Submit your annual reports
do I print from Linux?
Most other files should be
printed from their applications.
In general, the best way to print any type of file in Linux is from an
of viewing that file. So, print PDF files from a PDF viewer like acroread
or evince. Print a DVI file from a DVI viewer like kdvi
or xdviand print Graphics files from
an image viewer like kviewor display.
You can print some files from the command prompt, these include (to
printer lw3 in this example) :
are the public printers? Can I print from my laptop via the wireless
There are 6 public printers in the department. A listing of these
printers, their locations, and other facilites available within the
department is available at
Printing from the Wireless Network
The public printers are all accessible from the wireless network or
from any Duke IP address. You should use IPP
printing to connect to the server ipp://printhost.math.duke.edu
with queue name /printers/lw0for
example. Full instructions for connecting to these printers and what
drivers to use are available at http://www.math.duke.edu/computing/printing.html
classrooms have computers and how do I use them?
There are computers managed by the Mathematics Department in classrooms
05, 120, 205, and 216 in the Physics Building.
These rooms also provide cables for hooking up laptop computers for
display via the over head projector. All computers
in classrooms run the Linux operating system and should operate
identically to the other Linux machines in the department.
They also have the ability to run Windows applications via emulation.
You should select Windows from the login screen
to access this emulation capability.
There are also computers, managed by Arts & Sciences computing,
in rooms 113 and 114. They run Windows XP.
The computer in room 120, 113, and 114 are protected also by a touch
screen login panel. It has a telephone pad on the
screen that you need to enter the 4 digit password to use. Ask in the
front office for the password.
we have a scanner and how do I use it?
The department has a few of scanners available for your use.
The simplest method is to use
the photo copier. It is capable of
scanning many pages per minute and
will send you an email with a PDF attachment of your scanned document.
The only restriction is that scans will not be in color! Full
instructions are available at http://www.math.duke.edu/computing/copier.html
as well as posted in the copy room.
The is also a scanner in room 102 attached to the public
Windows XP machine. Login with your unix usename and password and then
run the program Photoshop from the desktop.
Further instructions are available at
Finally there is a scanner in the front office (Room 117) that
has a document
feeder available for scanning several
pages at once. Login to the Windows XP machine attached to this scanner
and use the program Acrobat to scan
directly into a PDF file. The front office staff should be able to
assist you with your scanning on this machine.
do I Move, Copy, or Delete a File from the Command Line?
Here are some useful commands to help you in managing your files :
NOTE SHORTCUT! : If you are using the default command shell, csh, or
tcsh, then any reference to your home directory can be abbreviated by
the character ~. For example, cd
~/bin will change your "current directory" to /bin.
- ls: This
command stands for List. If you type ls
and press enter, a list of files in the currend directory will be
displayed. Useful options include ls
-Cwhich will show the list in a column format, and
-lwhich will show the list is a long format with
more information. You may also combine these with the option -a to show
"All" files, including those that begin with a . and are thus called
"hidden" since they do not display without the -a option, e.g. ls -al.
Another useful option is ls
-Fwhich will differentiate file types in the
listing by adding a @ to links, a / to directories, and a * to
: This command stands for Change Directory. If you have
a subdirectory you wish to enter, you would type cd
name. To go up a directory, you would type cd ..
( ..stands for one directory up, .
stands for the current directory. )
: This command stands for Copy. It accepts two arguments
, source and destination files. If the destination filename is a
directory, the file is copied to that directory with the same filename
as the source file. E.g. cp
filename ~will copy the file filename
to ~ (your Home Directory).
: This command stands for Move. It works similar to copy but
the source file is removed after the copy.
: This command stands for Remove. It can accept any number
of files. E.g. rm
test.1 test.2 test.3will remove
the files test.1, test.2, and test.3.
: This command will Make a Directory. It can accept any
number of directory names. E.g. mkdir
test final groupwill create
directories test, final, and group under the current directory.
: This command will Remove a Directory. In can
accept any number of directory name BUT the directories to be removed
must be empty.
do I use a Floppy (or CDROM) under Unix?
If you are using the KDE or Gnome Desktop Environments, using a floppy
or CDROM is as easy as inserting your
disc and clicking on the appropriate icon on the desktop. You can then
read, copy, or delete files (delete
from floppy only) to and from the device. It is VERY
important to unmount the media before removing
it from the drive. In fact, CDs will not let you open the tray unless
they are unmounted. To unmount a disc,
close the window showing the files and close any files you are using on
the disc, then right click on the
same icon you used before and select Unmount. Then
you can safely remove the disk.
You can also access the devices from the commandline, its a bit more
complicated but here are some simple instructions :
To access the device, run the command lsdev
and select the device you wish to mount or unmount from the list.
If successful, the command will report which directory the device
was mounted upon. When you are done, run lsdevagain and select the device to unmount it. You can also specify a string as an argument to lsdevto automatically select an item from the list, for example lsdev CDwill usually mount or unmount the CDROM.
can I use PGP with Pine?
It is possible to configure the pinemail
reader to use PGP (Pretty Good Privacy) Encryption when sending and
You need to first create your PGP key. Type pgp -kg, select the
level of encryption, enter your name and your email address as shown in
the example, enter a Pass Phrase (Important, you will need to enter
this often, do not forget it), and then follow the directions on the
screen. This should tell you it has generated a key. It will store this
info in ~/.pgp. In general the defaults are sufficient.
Configure Pine to use PGP
- Start Pine and go into the Setup -> Config
- The following is assuming the binary papp
is located in /usr/local/bin. If not, please
change the paths accordingly.
- Near the end of the configuration options, change
display-filtersto this value :
"-----BEGIN PGP" /usr/local/bin/papp -passfile _DATAFILE_ -key
- Then change sending-filters
to this value :
/usr/local/bin/papp -encode -passfile _DATAFILE_ _RECIPIENTS_ -key
- Now save the configuration and restart pine
Using PGP within Pine
Pine will automatically attempt to decode messages received that are
encoded with PGP. It will
prompt you for your passphrase and decode the messages automatically.
To encode a message, compose you message as usual, but after hitting
CTRL-X to send the message,
you can either use the default filter (no encoding) or use the PGP
filter by pressing CTRL-N (next
filter). If you use the PGP filter, the message will be send encoded
with the recipients PGP
public key if available. If not, it will warn you that you don't have
their key. To add keys
to your PGP keyring, run pgp
Where can I find documentation on Latex (TeTeX)?
Check out this page LaTeX/TeX (Courtesy Michael Kozdron and Laura Taalman).
How can I use graphics with pdflatex?
See page 7 of the pdfTeX FAQ
How do I create a PDF file from a Postscript or DVI file??
- Converting a dvi file into a pdf file:
- To convert the dvi file filename.dvi into the pdf file filename.pdf, type
- Converting a dvi file into a postscript file:
- To convert the dvi file filename.dvi into the postscript file filename.ps, type
By Default, dvips now creates a ps file rather than directing the file to the printer.
- Converting a postscript file into a pdf file:
- To convert the postscript file filename.ps into the pdf file filename.pdf, type
- Converting a EPS file into a pdf file:
- To convert the postscript file filename.eps into the pdf file filename.pdf, type
- Converting a pdf file into a postscript file:
- To convert the pdf file filename.pdf into the postscript file filename.ps, type
acroread -toPostScript filename.pdf
You might want to try both to see which result looks better for your particular document.
- Viewing and editing pdf files:
- Acroread allows you to view your pdf files. To view filename.pdf, type
- Very limited PDF editing may be done with the pdfedit application. To edit filename.pdf, type
How can I post password protected web pages and files?
You can create subdirectories of your web tree in ~/public_html that
only to those with a username and password you designate. Here are some
warnings about this process at
do I allow certain users access to my files? What are ACLs?
ACLs are Access Control Lists. They allow you to set very fine grained
files to grant permission for individual users, or groups of users, to
read or write
files that you own. Currently, you need to manage your ACLs from the
and the configuration of ACLs is not trivial, it requires some
knowledge of how
permissions work on a unix system with regard to owners, groups, and
The best documentation I have found is available online at this page on
ACLs with Fedora Core 2. Start there and let us know if
having any problems. We can update our documentation here to help
you have any suggestions.
can I mount my home directory from my home Linux machine?
The best way to mount your department home directory on your home linux
machine is to use
the Fusekernel module and the Fuse program sshfs.
This is installed on all
machines manage that are running at least Fedora Core 4. If you need
help installing it
on another linux system, first check the
sshfshomepage for info and then check with us if you need
To use sshfs, create a directory where you want to
mount your home directory on your
home machine, something like ~/mathis approriate.
Then run the command :
sshfs cauchy.math.duke.edu: ~/math
It will ask for your password (if your username is different on your
home machine from the
department, use firstname.lastname@example.org: for the first argument
where username is
your user name on the department systems).
Now your math department directory is mounted on the directory ~/math
on your local machine.
When you want to unmount it you can either run the command :
fusermount -u ~/math
or in a pinch, kill the sshfs process that is running (killall
can I mount my home directory from my home Windows or MacOSX machine?
WebDAV stands for "Web-based Distributed Authoring and Versioning". It
is a set of extensions to the HTTP protocol which allows users to
collaboratively edit and manage files on remote web servers. What that
means is that you can store files in your home directory on the server
and securely access
them via standard https links for both upload and download. This allows
you to store a ICS Calendar file for use with applications like Apple's
iCal, Mozilla Sunbird, Evolution, KOrganizer, or any other WebDav
enabled calendering application. Furthermore, it provides a method for
mounting your home directory via the web on your home machine or
laptop. For further infomation, see our page on WebDav
by: System Support Staff