introduction to unix

Lect 4 P. 1

Engineering H192 - Computer Programming

Winter Quarter Gateway Engineering Education Coalition

Introduction to UNIX

Lecture 4

Lect 4 P. 2



Computing Environment

• PC vs. UNIX

– Many PCs use a version of the Microsoft Windows operating system (either 95/98/ME or NT/2000/XP).

– UNIX is an operating system used primarily on workstations. There are versions for Personal Computers. LINUX is a version of UNIX.

Lect 4 P. 3



UNIX

• Originally written by programmers for programmers at Bell Labs.

• Often is the operating system of choice for high-performance engineering workstations.

• Original (and still common) user interface is the "UNIX command line", although graphic user interfaces (GUIs) are available.

• Names of UNIX commands tend to be a little cryptic or strange.

Lect 4 P. 4



UNIX Command Line Interface

• We will use the "UNIX command line" user interface for much of the work in this class.

• The availability of some limited graphic user interface capabilities is provided by special terminal emulation software.

• Emulator runs on the PC and makes the PC system act like an "X-Windows" terminal.

• Simple Secure-Shell terminal emulation can also be used.

Lect 4 P. 5



Some Simple UNIX Commands

Simple Command UNIX MS/DOS

List files in directory ls dir

Delete a file rm file del fileDisplay contents offile on screen

cat file type file

Display contents offile on screen

more file more < file

Print workingdirectory

pwd pwd

Change directory cd /path/new cd \path\new

Lect 4 P. 6



Your Computer Accounts

• Each student actually has two separate computer system accounts:– One for the personal computers (in HI 324)– One for the UNIX system (SGI IRIX)

• Each account is established only for the duration of the current quarter (i.e., the files stored under your Autumn Quarter's account(s) are gone)

Lect 4 P. 7



Your User ID and Default Password

• The User ID for both of your computer accounts is simply your OSU email ID.

• The default password for both accounts is:– The first letter of your last name– The first three digits of your SSN in reversed

order– Your entire first name

• Written as one "word" in all lowercase

Lect 4 P. 8



Figuring out Your ID & Default Password

• So, as an example of a User ID and a default password, let's suppose:– Your name is "Woody Hayes"– Your SSN is 987-65-4321– Your OSU email address is [email protected]

• Then, Wayne Woodrow "Woody" Hayes would logon as:– User ID: hayes.1– Password: h789wayne

Lect 4 P. 9



Default Logon for PC Systems in HI 324

• Your UNIX "default" password:– The first letter of your last name– The first three digits of your SSN in reversed

order– Your entire first name

• Another possible default password:– Just your University ID (your 9-digit SSN)

• Attempt both of these methods and if neither work speak to the lab facilitator at the desk in 324 or your instructor.

Lect 4 P. 10



Logging On to a PC in HI 324

Windows XP Logon

• Press “Ctrl - Alt - Del”, if so instructed

• Fill in the new window with– Your User ID – Your Password (watch case)– The Domain (ENGR1)

Lect 4 P. 11



Logging On to the PC

User Name

Password

Domain

hayes.1

h789wayne

ENGR1

Lect 4 P. 12



Changing Your Password on the PC (Press Ctrl -- Alt -- Del)

Windows XP Security

Login Information

CancelChange Password

Log Off

Lect 4 P. 13



Changing Your Password on the PC

Domain

User Name

Change Password

Old Password

New Password

Confirm New Password

Lect 4 P. 14



Logging On to the SGI UNIX System

• On the PC --– Click on Start

• Go to Programs Submenu– Then go to Exceed Submenu

» Then go to Exceed (Task) and Click

Lect 4 P. 15



Today's Assignment – E3

• In assignment E3, you are asked to logon on to the UNIX system and try a few commands.

• In Part A, write down the command you typed for each of the seven steps.

• In Part B, choose an editor program and type in the given computer program.

• UNIX editor choices include:– vedit (or vi) – pico– emacs (X only)

introduction to unix

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