• how to log in
• how to register for this class
• how to write and read e-mail
• how to read and post articles on a newsgroup
• how to write, compile and run a simple C program

IMPORTANT: after your registration you MUST change your password for security reasons.
Type "ssh po.eecs.berkeley.edu". (You are connecting to a remote machine in order to change your password).
Type "passwd" and follow the instructions carefully.

Exit from po to return to your local machine, po is a old slow machine; it is better (and faster) for you to work on the local machine. To leave po, type "logout". Secure Shell, commonly shortened to ssh, allows you to securely access a remote machine. It is a significant improvement over the older, highly insecure telnet program. EECS Instructional machines may only be accessed via secure means like SSH. You can get a copy of SSH for your home computer here.

Open an xterm as described in the previous section. Type in "pine" and then the enter key. Your screen should look approximately like this:

To access the list of your e-mails press "I"
You can browse your messages with the navigation keys. To read one message select it using the navigation keys and then press enter. The message will be displayed. You can scroll with the navigation buttons.
If you want to write an e-mail to a friend you should press the "C" key from the main menu OR from the e-mails list page. Your screen should look like this now:

The fields are self-explanatory. You provide the e-mail of the person you are writing to in the field "To", the title of the message in the "Subject" field, and the body of the message under it. As always, use the navigation key to move among the fields.

Task 1: write an e-mail to a person sitting near you.

Open a console as described in the registration section. Type "tin" and then the enter key. Your screen should look like this:

To access the list of all the available newsgroups press the "y" key.
You can browse the newsgroups with the navigation keys. To subscribe one of them press "s", to unsubscribe use "u".

Press "q" to quit. To access a newsgroup simply select it from the main page with the navigation keys and press enter. Select the article you want to read with the navigation keys and then press enter to view it.

Task 2: subscribe the ucb.class.cs61c newsgroup

Open a console and type "emacs first.c". Emacs is a program that allow you to edit text files. You need to know two things:

• How to save the file
• How to exit from the program

#include <stdio.h>

int main() {

  printf("\n\nHello World!!!\n\n");
  return 0;

}

After you have done it save and close the EMACS window (Ctrl+ X + C). Now you have written your first C program. Try to type "ls" to see the list of all the file in your current directory.
A C program is a text file. You cannot execute it. You need to compile it and produce an executable file. In order to do it simply type "gcc -o hello first.c". Type "ls" after the compilation finished, you can see the compiler had produced a new file called "hello". You can execute it now, just type "./hello".

Task 4: Your first C program