COS 285

COS 350

COS 485

Connecting to the lab from home

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COS 160 - Structured Problem Solving: Java

• Setting up Java and Eclipse on your home computer
  
• Tutoring is available both in person and online. You can schedule an appointment at USM Learning Commons or call 780-4228.
  
• Labs: Lab1 Lab2 Lab3 Lab4 Lab5 Lab6 Lab7 Lab8 Lab9 Lab10 Lab11
• Programs:  Prog1 Prog2 Prog3 Prog4 Prog5 Prog6 Prog7 Prog8 Prog9 Prog10
• Eclipse on Macintosh Quick Reference
• Programming Style Guide
  
• Lecture Slides
• Video Lectures:
• L1 Intro
• L3 Terminology, example programs
  
• L7 Graphics
• Java Graphics Quick Guide
• DrawingPanel.java
• The old drawing panel that has more features, but has bad pixelation artifacts with Java 10 on some displays. old DrawingPanel.java
• If you are having trouble getting the drawing panel to work, you may have copied the files to the wrong place. Here is how it should look in your Eclipse project.
  
• DrawGrid.java simple program for drawing a grid on a drawing panel
  
• Course examples: KleenexPattern.java Connect4.java ShapeStacks2019.java
• Grading Guidelines
• Example paintings by famous artists.
• Paintings by Professor Boothe.
• Paintings by students.

COS 285 - Data Structures

• Web links for topics not covered in the book:
• Book's Website
• Some useful links suggested by students:
• Explanation of Big-O analysis
• Nice animations of sorting algorithms
  
• A more advanced data structures class from MIT
  

COS 350 - Systems Programming

• Book's website - use the "Jump to ..." pull down menu to find the book's example programs by chapter
• Tips for  linux - a nice collection of tutorials on a variety of linux topics
• Extra books recommended by students:
• "C for java programmers" by Tomasz Muldner
• "Head First C" by Griffiths & Griffiths
  

COS 485 - Design of Computing Algorithms

• Extra reading: Depth First Search
• Extra reading: union-find
  
• Extra reading: Maximum Flow - Note:  look at the Ford-Fulkerson Algorithm.
• Some useful links suggested by students:
• An MIT Introduction to Algorithms course
  

Connecting to the lab's linux machines from home

• You can connect to any of the linux machines: ant, beetle, firefly, honeybee, locust, mosquito, wasp. You can also just connect to "linux" which will pick a machine randomly to distribute the load. In the examples below wherever is says "linux", you can substitute an actual machine name.
  

• To use a Windows computer to connect remotely.  These are the programs I use and my configuration settings.
  
• To transfer files between the lab and a PC, I recommend filezilla
• File > Site Manager > Host: linux.cs.usm.maine.edu
  
•                                  > Protocol > SFTP
•                                  > Logon Type: Normal           
  
•                                  > User: <your user name>
  
•                                  > Password: <your password>
  
• To establish a text based terminal connection, I recommend putty.
  
• Session > Host Name: linux.cs.usm.maine.edu
  
•              > Connection type: SSH
• Windows > Colours (I changed the Foreground and Background colors because I don't like reverse video.)
• Windows > Appearance (I changed the font and point size.)
  
• Connection > Seconds between keepalives: 300
• Session > Saved Session give it a name > [Save]      You can then just load it next time
  
• Note: When you are logging in and it asks for your password, it does not print anything as you type.
• I further streamlined logging in by making a Windows shortcut to putty and adding command line options so that the Target looked like:
...(path)...putty.exe -load session name -l username -pw  password
• To establish an X windows graphical connection, I recommend Xming.  This is needed to run X windows applications such as ddd remotely.
  
• To allow Putty to accept the X windows commands:
• In the Putty Configuration
• Connection > SSH > X11
• Check: Enable X11 forwarding
• I also installed xming-fonts. This will give you more fonts choices.
• Font choices can be configured by editing the hidden file .Xdefaults in your home directory on the linux machines.
• xfontsel (kind of broken but useable) and xlsfonts display and list font choices

• To use a Mac or linux computer to connect remotely.
• Use the terminal application.
  
• At the prompt open a secure shell (ssh) connection with the command: ssh -X <your username>@linux.cs.usm.maine.edu
• The -X is optional. It allows using X windows graphical applications, such as emacs in its graphical mode or the ddd debugger.
• In the mac terminal program you can set up a profile to save this ssh command
• In the Terminal menu bar select Preferences
• + to create a new profile, give it a name such as USM
• under Shell > Run command:   type the ssh command as explained above
• now to start a remote terminal connection from the Terminal menu bar select: shell > New Window > USM
  

• On a mac, if you loose connections and get a "Broken pipe" message, I fixed it by configuring ssh to send keep alive messages:
• Open the terminal application on your mac (locally).
• It will start in your home directory.
• Go to the hidden directory .ssh:

• You want to add this to the config file:

• I didn’t have a config file so I just created one with cat and directly entered the file contents. Press Ctrl-D when done.
  

• To transfer files between to/from the lab you can use filezilla as above
• Or use sftp directly. Connect with sftp username@linux.cs.usm.maine.edu     Some basic commands are:
• cd path    - change directory on remote machine
  
• lcd path    - local change directory
• ls              - list files in remote directory
• lls             - local list files
  
• put file      - upload a local file onto remote machine
• get file      - dowload a remote file onto local machine
  
• Here are instructions for installing the C debugger DDD on a Mac.