https://www.cs.vassar.edu/ 2026-06-13T23:22:25+00:00 https://www.cs.vassar.edu/ https://www.cs.vassar.edu/_media/favicon.ico text/html 2022-08-31T12:49:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/general_linux/sshkeysmswindows?rev=1661950198&do=diff SSH Keys on Microsoft Windows using the PuTTY Utility SSH keys are what you will use to establish an encrypted connection over the network, e.g. the internet, between your system and a remote machine. The default type of key to generate is RSA which is good for most purposes. RSA is universally supported among SSH clients. Note that EdDSA performs much faster and provides the same level of security with significantly smaller keys. In general, though, for what you need to do, RSA encryption is … text/html 2015-08-26T20:52:53+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/general_linux/backups?rev=1440622373&do=diff FIXME update, convert to wiki, add link to isohome Backup With Tar ---------- * Overview * Creating a tar file of your entire directory * Copying the file to another location * Tar Documentation ---------- 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 n… text/html 2023-02-20T17:02:22+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/general_linux/command_please_not_found?rev=1676912542&do=diff Command 'Please' not found If you see this when you use SSH to log into a system Command 'Please' not found, did you mean: command 'please' from deb pleaser (0.5.1-4ubuntu0.22.04.1) Try: apt install <deb name> and each time you enter a command, this error message is displayed, then something is not right. This means you are logged into a system you should not be logging into but only using as a proxy or gateway. What is likely causing this is that you have some software configu… text/html 2009-10-14T17:24:59+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/sysnews/isohome?rev=1255541099&do=diff Backup to CD/DVD ---------- * * * * * * ---------- <BOOKMARK:quick> The really short version of the instructions If you just want to do this without delay and can get to the CS lab... * Bring a blank CD or DVD to the lab * text/html 2016-05-18T15:53:52+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/general_linux/info?rev=1463586832&do=diff Bash Shell Resources 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/> System Info - User Help ---------- Help for New Users Unix information and help Examples for … text/html 2020-07-04T21:02:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/general_linux/vnc?rev=1593896566&do=diff Using VNC What is VNC? NOTE: VNC is deprecated. For all remote desktop access, we ask that you use X2Go (found here). VNC is a system for interacting with a computer display remotely, over a network. This technology was developed by AT&T Laboratories, and is now available for free over the internet (distributed under the GNU General Public License. Visit the text/html 2022-11-10T16:19:51+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/keyring_issues?rev=1668097191&do=diff Keyring Issues If you are using an application, e.g. GitHub, and you get an error because of your “keyring” then a quick workaround is to find that keyring and push it out of the way. Open a terminal and use the find command as such: $ cd $ find . -type f -name "*ring" ./.local/share/keyrings/login.keyring text/html 2010-12-08T19:20:36+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/sysnews/inhouse/server_list?rev=1291836036&do=diff CS Servers Physical CS Department Servers Date Number installed Disks Space NAME type In Srv CPU & speed memory #xSize,type tot/used Function Pacific x3650 2007.1 Xeon 4x3gig 12gig 6x73g,sas text/html 2010-12-06T15:30:28+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/sysnews/kill_a_process?rev=1291649428&do=diff Monitoring and Killing Processes 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.$$xfce4-taskmanager$$````````$$gnome-system-monitor$$```````` text/html 2011-09-22T17:43:12+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/sysnews/java_system_tips?rev=1316713392&do=diff Java issues and tips 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.```````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````` text/html 2011-05-10T16:58:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/sysnews/ewc?rev=1305046736&do=diff Export a window to the Projector Please note, the instructor's workstation in room 105 has a resolution of 1280×1024, the student workstations have screen resolutions of 14450×900. Please resize any window you want to export to fit on the display where you are exporting it. ```````````````````````````````````````````````` text/html 2010-11-24T23:10:16+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/sysnews/acm_jar_applets?rev=1290640216&do=diff Using acm.jar The ACM Java Task Force (JTF) created an API framework for Java programs which is distributed in the file acm.jar. Programs using acm.jar may be compiled and executed from the command line, or within your favorite Java IDE (e.g., Netbeans, DrJava). It is also possible to run your JTF programs as an applet within a browser or via the appletviewer. ```````````````````````````````````` text/html 2025-06-27T18:51:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/general_linux/priority?rev=1751050267&do=diff System Priorities Priorities of programs are something to be aware of. PS The first thing to do is to get to know your processes. The ps command lists out the processes you have running on the system. By using ps -l, an extended listing of your processes is provided. The fields of the most interest to this topic are the PID, NI, and COMMAND fields. The COMMAND field lists the name of the command that started your process. So, if you're looking for your runaway c++ program, a.out is the one yo… text/html 2023-01-19T02:50:27+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/general_linux/sshkeys?rev=1674096627&do=diff Setting up SSH Keys Note : This tutorial assumes that you are running a linux-based operating system. The procedure for setting up keys on an Apple Mac OS X machine is similar to this procedure, but you may need to make some minor adjustments. There is a separate text/html 2023-04-06T14:19:45+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/possible_issues_with_remote_webui?rev=1680790785&do=diff Possible Issues when using the Remote WebUI 1. Why do I get bumped off after 4 - 5 hours? There is a time limit on the connection because several people have forgotten to log out and left their user home account files open and tied to remote system. Therefore a timer will kick you off after four or five hours to close all of your applications and files for you so that your files are not corrupted. Save your work often! Close all of your applications and disconnect or logout when you are done o… text/html 2023-01-05T22:19:50+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/general_linux/mitm?rev=1672957190&do=diff Host Key Verification Failed At some point you may attempt to SSH into a server, workstation or device, e.g. “my_server”, that you have logged into before and you encounter a long, scary message as follows that ends with “Host Key Verification Failed text/html 2023-02-14T20:09:25+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/general_linux/forwarding_x11?rev=1676405365&do=diff Forward X11 Very few systems here are configured to forward X11 via SSH. And this will generally be reserved for request by the faculty and not for classroom computers. If you require a GUI environment then you are strongly encouraged to use the Guacamole server by logging in at text/html 2015-08-27T14:16:13+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/general_linux/emacs_tips?rev=1440684973&do=diff Emacs Tips 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>. … text/html 2022-09-02T18:02:19+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/general_linux/account.size?rev=1662141739&do=diff Account Size 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 text/html 2015-08-26T21:23:27+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/apps/jedit?rev=1440624207&do=diff Jedit tip -. 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 ```````````````````````````````````````````````````````````````` text/html 2010-10-29T19:16:06+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.cs.vassar.edu/help/sysnews/inhouse/using_htaccess?rev=1288379766&do=diff Using htaccess for web pages Please note: htaccess is for pages served from OUTSIDE THE WIKI in users directories. The wiki has similar ability, but it is set up differently -Greg Web Access Restriction by user/password This can be used in many ways, the user and password are not related to our system users and passwords, so you can use anything you like, however, there is no mechanism for the web users to maintain or reset their htaccess password so it can become a maintenance nightmare qui…