http://wiki.cs.vassar.edu/ 2009-11-22T18:16:03-05:00 http://wiki.cs.vassar.edu/ http://wiki.cs.vassar.edu/lib/images/favicon.ico text/html 2009-10-14T13:28:59-05:00 http://wiki.cs.vassar.edu/sysnews/account.size?rev=1255541339 Here are a few tips for managing the size of your Computer Science Unix account. ---------- ---------- How Much Space does My Account Use? du -s -h /home/YOUR_ACCOUNT_NAME This command will give you your total account size. The “-h” stands for “human readable” and it appends a size letter, such as `M’ for megabytes, to the output. The “-s” gives only the total for the file or directory rather than a break down for all directories. text/html 2009-09-30T16:58:26-05:00 http://wiki.cs.vassar.edu/sysnews/adding_tomcat_to_netbeans?rev=1254344306 Page in progress  --- Greg Priest-Dorman 2009/09/29 14:33 Note: these instruction are for the setup in the Vassar College Computer Science Department Lab.  They may contain information not appropriate to an install elsewhere. 0) Overview This setup will let you run your own tomcat webserver on the local machine for building and debugging apps in netbeans. There is one command to be typed in a terminal, all other steps will be preformed from within netbeans.  Total time to complete these … text/html 2009-10-14T13:33:01-05:00 http://wiki.cs.vassar.edu/sysnews/backups?rev=1255541581 FIXME update, convert to wiki, add link to isohome ---------- ---------- Overview While I make regular backups of the home directories on the Computer Science Unix machines, there are times when you want to have your own copy of your account. There are several relatively painless ways to accomplish this task. I will describe one of them here. If you need my help, please ask. If you know of a way I could describe this process better please let me know so I can share it. text/html 2009-10-05T15:20:39-05:00 http://wiki.cs.vassar.edu/sysnews/drjava_-_no_compiler_available?rev=1254770439 Problem: when staring DrJava the Compiler Options window reports “no compiler available” To fix this you need to set the tools.jar location in the drjava preferences.  Start drjava and follow these steps: Edit --> Preferences Set the location of the tools.jar file to be text/html 2008-05-06T14:28:51-05:00 http://wiki.cs.vassar.edu/sysnews/emacs_tips?rev=1210098531 Emacs Command Shorthand From the emacs built in tutorial Emacs commands generally involve the CONTROL key (sometimes labeled CTRL or CTL) or the META key (sometimes labeled EDIT or ALT). Rather than write that in full each time, we'll use the following abbreviations: C-<chr> means hold the CONTROL key while typing the character <chr> Thus, C-f would be: hold the CONTROL key and type f. M-<chr> means hold the META or EDIT or ALT key down while typing <chr>. If there… text/html 2008-04-25T11:00:41-05:00 http://wiki.cs.vassar.edu/sysnews/frozen?rev=1209135641 If you have a process, a window, or a machine that seems to have “frozen” while you were working on it, became “stuck,” is not responding to the keyboard or mouse, or is spewing out garbage into a window here is what you can try. If the steps below don’t work, please get more help! Either ask a coach, an instructor or find or write me. Please don’t just walk away -Greg text/html 2009-08-13T13:38:49-05:00 http://wiki.cs.vassar.edu/sysnews/gate_tips?rev=1250185129 Help! I still get GATE 5.0 Beta, not GATE 5.0 When you run gate you should see that you are running GATE Developer 5.0 build 3244. If you are not, then to use the new version you need to do the following 2 steps: rm ~/.gate.xml gate-fix After that you may still need to configure your CREOLE Plugin to use the new path. You do that from text/html 2009-02-25T13:47:28-05:00 http://wiki.cs.vassar.edu/sysnews/hall_of_shame?rev=1235587648 (No names, just examples) Cracked passwords The following passwords were cracked and are no longer being used on our system: ’ text/html 2008-04-25T11:01:17-05:00 http://wiki.cs.vassar.edu/sysnews/iceweasel_thinks_it_is_running?rev=1209135677 Problem: iceweasel, firefox or mozilla will not start and the message you get is something like this one: Iceweasel is already running but not responding. To open a new window you must first close the existing Iceweasel process or restart your system First question - are you sure it is not true?  Are you logged in somewhere else?  Did you leave yourself logged in remotely?  If so, please try to close that session. If not, or if the problem persists read on. text/html 2008-12-14T13:16:59-05:00 http://wiki.cs.vassar.edu/sysnews/info?rev=1229278619 ---------- Contents: ---------- Help for New Users Unix information and help Examples for many Unix concepts and commands from the University of Edinburgh. This is a really good place to start! Useful Unix commands A short list of some commonly used commands from now alum Ethan Gold text/html 2008-10-24T13:01:19-05:00 http://wiki.cs.vassar.edu/sysnews/introlab_tips?rev=1224867679 Still in draft Using the Projector 1 General Projector Info 1.1 Find the Remote It’s usually on the end of the chalk board. It looks more or less like this picture of a similar model remote. 1.2 Turn it on Blue button in the upper right text/html 2008-05-06T22:42:44-05:00 http://wiki.cs.vassar.edu/sysnews/isohome.script?rev=1210128164 Isohome is a simple script that tries to make an image of your CS home directory that is suitable for burning onto a CD or DVD. It will confirm that you are running it from the machine where your home directory is actually a local disk. If not it will tell you which machine you need to run the script from. text/html 2009-10-14T13:24:59-05:00 http://wiki.cs.vassar.edu/sysnews/isohome?rev=1255541099 ---------- ---------- The really short version of the instructions If you just want to do this without delay and can get to the CS lab... “” You’re Done! If you prefer more detail about the process, read on... Overview While I make regular backups of the home directories on the Computer Science unix machines there are times when you want to have your own copy of your account. There are several relatively painless ways to accomplish this task. On this page I describe creating a CD… text/html 2009-09-24T14:09:45-05:00 http://wiki.cs.vassar.edu/sysnews/java_system_tips?rev=1253815785 Java remote method invocation problem Problem: When running a demo of Java’s remote method invocation on our Ubuntu 9.04 based linux machines running java-6-openjdk the client could only attach to a server running on the same host. Solution: Professor Ellman discovered that the fix was to explicitly tell the server its hostname or IP address.  This was accomplished by adding text/html 2009-02-25T12:43:47-05:00 http://wiki.cs.vassar.edu/sysnews/jedit_and_end_of_line_codes?rev=1235583827 1. End of line codes When using jedit to edit files that will be saved on a remote linux or unix system, you may run into problems if you don’t change the code jedit puts at the end of the line to indicate a return. Jedit calles this the default line separator. text/html 2008-05-06T14:32:33-05:00 http://wiki.cs.vassar.edu/sysnews/kill_a_process?rev=1210098753 Any process you own you can kill (this is not a moral judgment, just a fact of life in Unix and Linux). Killing an offending process graphically If the machine itself is still responsive (but one or more windows perhaps aren’t) you can try one of the Graphical Process Managers on our system. text/html 2008-12-14T13:22:12-05:00 http://wiki.cs.vassar.edu/sysnews/learn_bash?rev=1229278932 a few articles and tutorials on the web for learning the bash shell <http://www.arachnoid.com/linux/shell_programming.html><http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html><http://www.panix.com/~elflord/unix/bash-tute.html><http://www.codecoffee.com/tipsforlinux/articles2/043.html><http://www.cyberciti.biz/nixcraft/linux/docs/uniqlinuxfeatures/lsst/> a very early document on using the unix shell by Steve Bourne <http://partmaps.org/era/unix/shell.html> --- Greg Priest-Dorman 2008/12/14 13:22 text/html 2009-02-13T14:00:08-05:00 http://wiki.cs.vassar.edu/sysnews/printing_tips?rev=1234551608 You are in control of your printout We have a central print spooler. This means that when you print something the print job leaves the computer you are sitting at and goes to this print spooler. Once there it waits its turn to print. You can check on your print job, delete your job, restart it or move it to another one of our printers while it is on the spooler. To do any of these, head over to: text/html 2008-03-21T11:38:10-05:00 http://wiki.cs.vassar.edu/sysnews/priority?rev=1206113890 FIXME for linux, and include xfce4-taskmanager help Priorities are something you usually don’t have to worry about on our system. However, if you’re running a particularly computationally complex algorithm for a period of time, other users may be adversely affected. This is more of an issue if you are running on mote33 than on the lab ‘Pizzabox Suns.’ So, if you need to know how to make your big, bad program play nice with the other children, this page is for you. text/html 2009-09-29T11:23:50-05:00 http://wiki.cs.vassar.edu/sysnews/recently_installed_software?rev=1254237830 Linux Labs and Desktops GATE 5.0 rm ~/.gate.xml gate-fix Gate tipsPLT 4.2.1DrScheme/usr/local/share/plt-4.1.4DrSchemePLTdrschemedrscheme-lastNLTK 0.9.8python2.5pythonLabVIEW in progresspsi installedGaim removedPidgin installedgaimWine removedRuby 1.9’NLTK 0.9.7 Previous version was 0.9b2. This is a package for python 2.5. To use python 2.5, use the command text/html 2008-02-11T16:41:51-05:00 http://wiki.cs.vassar.edu/sysnews/remote?rev=1202766111 FIXME writeme! SSH instructions GUIssh username@mote33.cs.vassar.eduPuTTYVNC instructionsSSH’ text/html 2009-08-27T12:30:23-05:00 http://wiki.cs.vassar.edu/sysnews/screen_saver?rev=1251390623 Our lab linux machines use an inhouse setup to do screen locking and auto-logout. If you want a screen saver mode other than random here is what you do: For example, if I wanted the mode called “space” which gives a moving star field I could get it by typing the following in a terminal: text/html 2009-10-14T13:12:46-05:00 http://wiki.cs.vassar.edu/sysnews/sidebar?rev=1255540366 System StatusSystem Info - User HelpRemote Shell AccessRemote Desktop Access text/html 2008-05-02T18:19:05-05:00 http://wiki.cs.vassar.edu/sysnews/site_search_options?rev=1209766745 We actually have several publicly viewable websites here at CS. There is the primary site and in addition several projects have their own servers. To further muddle things, we have a content management system, conventional web pages and cgi pages. text/html 2009-03-02T16:18:59-05:00 http://wiki.cs.vassar.edu/sysnews/ssl_cert_issue_explanation?rev=1236028739 We run two apache2 servers at this site. These two instances of apache2 serve multiple wikis and web sites. They are located in the Computer Science Department of Vassar College. As a result, they all get the same site certificate. In some cases that works just fine. But in some cases your browser will complain about not being sure if it should trust the certificate or not being able to verify the certificate. text/html 2008-05-07T10:28:13-05:00 http://wiki.cs.vassar.edu/sysnews/status?rev=1210170493 text/html 2008-04-25T11:02:52-05:00 http://wiki.cs.vassar.edu/sysnews/svn_use?rev=1209135772 The following is modified from an email sent by Prof. Smith on the use of the command line svn program under linux here at CS -Greg To checkout (co) repository for first time svn co https://OUR_SVN_SERVER/svn/project myproj To check the status of a *particular* file text/html 2007-12-19T07:10:16-05:00 http://wiki.cs.vassar.edu/sysnews/tabs?rev=1198066216 System Info - User Help Status Remote Access Frozen Machine Account Size text/html 2008-01-29T22:31:59-05:00 http://wiki.cs.vassar.edu/sysnews/tips_for_instructors?rev=1201663919 Creating Dropboxes Before your students can use the submit exists. If any of the above items need to be set up please let me know well in advance of your first lab! To create the dropboxes: 1. Become the course user you@yourmachine:~$ ssh cs555@vnc 2. Deal with any existing dropboxes text/html 2009-11-16T09:26:44-05:00 http://wiki.cs.vassar.edu/sysnews/top?rev=1258381604 The printer known as Asprey has temporarily been replaced with another printer.  The replacement printer is only a single sided printer.  --- Greg Priest-Dorman 2009/11/16 09:23 Fall 2009 Upgrade Gotchas     * XFCE changed the defalt icon setup so you may need to redo icons the first time you use the new build. See  Where are my Icons?    * You may need to set your preferred browser.  XFCE menu --> text/html 2008-03-05T13:25:02-05:00 http://wiki.cs.vassar.edu/sysnews/use_and_abuse?rev=1204741502 From time to time issues of computer privacy, fair use, or appropriate use of The Computer Science Department Computer Facilities come up. Any discussion must start with an understanding of the campus regulations on computer use. To aid is such discussions, here is a copy of pages 111 and 112 from the College Regulations.  It is available from The Dean of the College‘s website. Please consult that site for the current version.  I site this here for reference only, for any athoritative u… text/html 2008-12-15T11:44:36-05:00 http://wiki.cs.vassar.edu/sysnews/usefull.commands?rev=1229359476 FIXME for linux! Definitions Files, Directories and Paths filefilenamedirectoryfilesdirectoriesfilesdirectorieslinksdevicesfoldersnamespacespathPathesrelativeabsolutecheese ls ~/cheese/ linklinkaliasshortcut Programs, commands and your Shell * a shell is the interactive command line interpreter to Unix. Typically you will have a prompt that looks like “%” or “~%”. Usually you will see it in an xterm which looks like a small terminal window. text/html 2008-10-24T13:22:31-05:00 http://wiki.cs.vassar.edu/sysnews/wacom_tablet_tips?rev=1224868951 NOTE: Currently the 5 buttons on the tablet itself are not detected by the windowing system. I am working on fixing that. -Greg Making the machine aware of the tablet Because we do not leave the tablets connected to particular machines, the Xserver needs to be restarted to properly recognize the device. text/html 2009-09-28T11:07:33-05:00 http://wiki.cs.vassar.edu/sysnews/where_are_my_icons?rev=1254150453 If you find that you have logged onto the system this year, and all of your shortcut icons are missing, don’t worry. You can get them back. First off, the buttons are still there. The icon has just been set to “no icon.” If you hover over the taskbar, you will see the application the blank button links to, as shown. text/html 2008-10-24T13:56:03-05:00 http://wiki.cs.vassar.edu/sysnews/xournal_tips?rev=1224870963 Xournal is a Pen Journal that also allows you to add annotations to PDF files and/or capture and import arbitrary windows on the current screen to use them in xournal. xournal's sourceforge site Documentation for xournal A few common commands and settings INVOKE XOURNAL FROM THE GUI To start xournal either invoke it at a command line or select it from the menues. In xfce it on the Accessories menu. SET BACK OF STYLUS TO BE THE ERASER To allow the back of the pen to work as the e…