Agenda

• Overview of Seneca Computer System– File Servers / Student Computer Accounts– Telnet application– How to Logon to Learn / Phobos accounts

• How to Change your Password

• Basic Unix Commands– pwd– ls (Various Options)

Computer Networks

• Personal computers that are not connected to other computers (via network cards) are referred to as “stand-alone” computers.

• Institutions such as colleges find it more economical and efficient to connect up personal computers to form a computer network

Computer Network

File Server(Central Computer)

Terminal(Client)

Terminal(Client)

Terminal(Client)

Terminal(Client)

Terminal(Client)

Terminal(Client)

File Server

• A file server is a powerful centralized computer system with an operating system that allows multiple users to access software applications and data files.

• The file server may also provide other important services such as network printer management and connection to other networks (Internet)

Computer Networks

• Computers connected to form a network over small geographic locations (such as a building or city) are referred to as Local Area Networks (LANs)

• Local Area Networks can use modems or routers to connect up to other LANs from far distances to form Wide Area Networks (WANs)

Advantages of Computer Networks

• Economical– Ability to share hardware devices such as printers

and scanners

• Efficient– Ability to communicate among users

– Efficient method to maintain and upgrade software (I.e. one copy of software on file server - therefore, only upgrade one location)

– Ability for users to share files

Seneca Computer Network

Newnham Campus

Modem Pool

NewnhamCampus

SIRUSLEARNMERCURY

Remote Users

Internet

Seneca@York Campus

T1T1

Seneca Computer Network

Seneca@York Campus

Seneca@York

Newnham Campus

T1

PHOBOS (RS6000) VISION “ CS “ PANDORA LINUX

Relevant Servers

• LEARN– Used to read and send e-mail. Phobos password will

be e-mailed to this account

• PHOBOS– Computer account used for creating, modifying,

compiling and executing programs

• VISION– Used to store and maintain a student webpage. Need

to request permission for account

Steps to Logon to PHOBOS

• Access Sirus from web browser

• Complete Sirus screen to generate LEARN & PHOBOS accounts

• Setup / Read e-mail in LEARN to obtain PHOBOS account name & password

• Telnet to Phobos account - Read e-mail and record VISION password

Steps to Logon to PHOBOS

• Logon to SIRIS to create account. Change Learn password. Remember to use your 5 digit PIN number to logon to SIRIS.

Steps to Logon to PHOBOS

• Setup & access LEARN email via Netscape to check e-mail to determine your PHOBOS username and password. Logout of LEARN account

• Logon to PHOBOS account via telnet application. Change password and LOGOUT of PHOBOS account.

Setup Netscape to Access LEARN mail

• Launch Netscape, point and click onto EDIT menu and point and click onto preferences

Setup Netscape to Access LEARN mail

• Point and click onto the plus sign to the right of the “Mail & Newsgroups” category: this will expand the selection. Point and click onto Identity

Setup Netscape to Access LEARN mail

• If you are using Netscape at the Seneca College labs, you will have to type in the following information for every new session:– Your name– Your LEARN e-mail address

Setup Netscape to Access LEARN mail

• Point and click onto “Mail Servers”, and enter the following information:– Mail server user name: type your username– Outgoing mail: type learn.senecac.on.ca– Incoming mail: type learn.senecac.on.ca

• Make sure that Mail server Type is set to IMAP (Select the option “move deleted messages in trash”)

• Point and click onto OK

Setup Netscape to Access LEARN mail

How to Read E-mail via Netscape

• Point and click onto the mailbox button:

• Point and click onto the New Message button to read your e-mail

How to Read E-mail via Netscape

• You will required to enter your LEARN password (not the 5 digit number, but actual LEARN password you created in SIRIS)

• WARNING:– Make sure to close Netscape after reading your

e-mail messages; otherwise, people can read your e-mail and send e-mail with your e-mail address.

How to Logon to PHOBOS Server

• Run Telnet Program

• Type in your Login I.D.

• Type in your password

Note: For first time-users, you must go to

Siris, create a learn account, read e-mail

message in LEARN account via Netscape

regarding PHOBOS username &

Password

What is the Telnet Application?

• Unix systems such as PHOBOS were originally designed to accommodate “dumb terminals” which were simply monitors and keyboards directly connected up to network

• Telnet allows the server to “think” that the user’s personal computer is a “dumb terminal”

• A common type of “dumb terminal” was Digital Equipment corporation’s VT100.

Telnet Application

• To launch or “run” the Telnet application from the Seneca computing lab, point and click onto the application “telnet” on the Windows 95 desktop

• You can obtain a free version of Telnet application for home use (assuming you have computer system with modem). More details in following lessons

Protecting your Computer Accounts

• It is important to assign an appropriate password to prevent unauthorized access to your computer accounts.

• Concerns regarding unauthorized use:– Illegal Activity– Suspension of account– Loss of data / Copying of assignments

Password tips

• Avoid easily detected passwords such as names or a series of numbers.

• Use phrases and take the first letter of each word

For example:

Autumn leaves Turn red, yellow, orange

Password Tips

• Combine upper and lower cash letters

• Include a non alpha-numeric characters such as . - in your password

• Acceptable passwords on PHOBOS and LEARN range from 6 to 8 characters

Changing your Password

• After logging onto PHOBOS, you can change your password by typing at the $ prompt:

passwd <ENTER>

Note: It is recommended to change password periodically.

Basic Unix Commands

Listing Files:ls Displays compact list of files (excluding

hidden files - beginning with period)

ls -a Displays all files (including hidden files)

ls -l Displays detailed list of files (excluding

hidden files)

ls -al Displays all files in detail form (including

hidden files)

Homework

Create an acceptable password using the above-mentioned techniques. Be prepared to change your password in next computer lab.