1. Md. Istiaque Shahriar isti531@gmail.com
COMP346
Lab1 - How to start?
Md. Istiaque Shahriar

2. We will start with The following topics
Basic Information
Subscription to mailing list?
Down load assignments
Link to Electronic submission?
Why do we need Java 1.2.1?
How to connect to the alpha server?
Work from your home pc
How to modify your .cshrc file?
How to move and compile YourFile.java on the alpha server?
Md. Istiaque Shahriar

3. Some Basic Information
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To see previous postings [downloading assignments]
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send to
Assignments are to be submitted electronically at
Md. Istiaque Shahriar

4. Md. Istiaque Shahriar isti531@gmail.com
Why do we need Java 1.2.1?
For the purpose of learning various concurrency problems for the time being we’re stuck with the above mentioned JDK version on Linux. JVM of that version was installed in such a way so it uses so-called “green” threads, and manages them itself using the Round Robin scheduling policy (there are many policies out there, you’ll get to know what most of them are later on in the course), so the behaviour of the threads can be considered deterministic.
NOTE: Java is for Linux. For UNIX (ex. Solaris), Windows NT/2K/XP and Cygwin use
SunOS 4.x implemented "light-weight processes" or LWPs as fibers known as "green threads".
Md. Istiaque Shahriar

5. How to connect to the alpha server?
You must have an alpha account ie. You encs account
If you wish to use the alpha server from
home (or anywhere outside Concordia) you should use the full name of the server - alpha.cs.concordia.ca in you ssh client.
otherwise the short name alpha is enough from the Lab.
Md. Istiaque Shahriar

6. Md. Istiaque Shahriar isti531@gmail.com
From Windows
From Windows:
You need a ssh tool such as one of listed below:
Tera Term - should have a shortcut on your desktop under the icon “telnet”;
PuTTY - a free tool that could be easily found on the net. Use the tool with the option “ssh” and the host “alpha” (or alpha.cs.concordia.ca).
You may download it from here
And see the setup from here
SSH Client- This is like the one which you use from the Lab
A free version is available at:
Or directly
and down load  SSHSecureShellClient exe
Md. Istiaque Shahriar

7. Working In Windows (If you prefer??)
Write your java program using any of the convenient editors (even the text editor is a good option)
Create a folder (Comp346 is preferred) in the Network U: (Unix) drive
Put (save) your .java file in that folder
Now Connect to the alpha server (as described) using SSH Secure Shell Client (You’ll find one on the Desktop)
Now Compile and Run your program
javac FileName.java
Java FileName
Md. Istiaque Shahriar

8. Md. Istiaque Shahriar isti531@gmail.com
From Linux
From Linux:
Use Linux OpenSSH, which is already installed on your system.
To confirm this open a terminal window and type type: ssh –v
To connect to “alpha” or “sunset” server type:
ssh -X alpha or
ssh -X sunset or
ssh -X alpha.cs.concordia.ca.
Md. Istiaque Shahriar

9. First modify your .cshrc file
List all the files in your home directory to see if there is a file under the name of .cshrc . Type : ls –a If there is no such a file then: 1. Download the file from here:
Feel free to modify this file and if you have any problems you can always download the file again. 2. Save the file in your home directory. 3. After downloading the file open a terminal and go to your home directory. 4. Typing source .cshrc will execute the script for you. 5. Use a text editor of your choice to view the file and make changes (for example gedit, xemacs, emacs, vim, pico etc.).
Md. Istiaque Shahriar

10. First modify your .cshrc file
If there is such a file then:
1] Open the file for editing. Use a text editor of your choice to view the file and make changes (for example gedit, xemacs, emacs, vim, pico etc.).
2] Add to the beginning of set path clause the path /pkg/java-1.2.1/bin .
3] The new set path clause should look like this: set path=( /pkg/java-1.2.1/bin /usr/ucb /usr/bin /usr/sbin /bin ...)
4] To limit the virtual memory add in a new row limit vm 300m . Now, your .cshrc file should hold the following info: set path=( /pkg/java-1.2.1/bin /usr/ucb /usr/bin /usr/sbin /bin ...) limit vm 300M
5] Save the changes and close the text editor.
Md. Istiaque Shahriar

11. Md. Istiaque Shahriar isti531@gmail.com
The .cshrc File
#cshrc January 24, 2004
# Originally written by Emil vassev
# This is where your personal configuration information is held
# Feel free to edit this file and change things around as much as you wish
# Lines preceeded by a # are comments, a \ is used to continue commands across multiple lines
set path=( /pkg/java-1.2.1/bin /site/bin /usr/bin /usr/sbin \
/bin /usr/hosts /usr/X11R6/bin /sbin /usr/lib \
~ ~/bin ~/bin/dev )
# noclobber prevents accidently destroying existing files by redirecting input over an
# already-existing file.
set noclobber
limit vm 300M clear
# EOF
Md. Istiaque Shahriar

12. How to move and compile YourFile.java on the alpha server?
1] Writing your program: Use any text editor to type your java file (the one you wish to compile and run on the alpha server).
2] File Transfer:
a. Use a file-transfer tool (SSH Secure File Transfer Client) to move the file to the alpha server if the file is not there. OR b. If you work under Windows on a lab PC you could simply use your “U” drive, which is your Linux drive space. There you can edit and run your java applications without having the need to move files around. (we may prefer)
3] directory comp346:
If there is no directory comp346 under your home directory
type: mkdir comp346
4] To Compile: javac FileName.java
5] To Execute: java FileName (no extension needed)
Md. Istiaque Shahriar

13. Writing your first program("Hello World“)
A Checklist 
Work under Solaris platform
connect to
either “alpha” server or
“Sunset” server
Correct Version To write your first program, you need correct version of java:
The JDK A
A text editor. In this example, we'll use NotePad, a simple editor included with the Windows platforms. You can easily adapt these instructions if you use a different text editor.
Make sure that the file name and the class matches exactly.
Md. Istiaque Shahriar

14. Md. Istiaque Shahriar isti531@gmail.com
The First Program
/**  
* The HelloWorldApp class implements an application that  
* simply displays "Hello World!" to the standard output.   */
class HelloWorldApp {     
public static void main(String[] args) {         
//Display "Hello World!"         
System.out.println("Hello World!");      } }
Save filename as “HelloWorldApp.java”
Md. Istiaque Shahriar

15. Md. Istiaque Shahriar isti531@gmail.com
When you're finished, the dialog box should look like this.
Md. Istiaque Shahriar

16. Md. Istiaque Shahriar isti531@gmail.com
References
man ssh 5.
Have a great Weekend
Md. Istiaque Shahriar