IT 244: Introduction to Linux/Unix
Class 13, Tuesday

Today's Topics

Tips and Examples


New Material

Quiz 4

Let's look at the answers to Quiz 4 Quiz 4.

Homework 7

I have posted homework 7 here.

It is not due this coming Sunday.

Instead is due on the Sunday of the following week, October 28th.

This is to allow you time this weekend to study for the mid-term.


The mid-term exam for this course will be held on Tuesday, October 23rd.

It will consist of 25 questions like those on the quizzes.

You will have the entire class period to work on the exam.

60% of the questions will come from the Ungraded Class Quizzes.

The last class before the exam, Thursday, October 18th, will be a review session.

You will only be responsible for the material in the Class Notes for that class on the exam.

The Mid-term is a closed book exam.

Today's New Material Not on Mid-term

The new material in today's class will not appear on the Mid-term.

You will only be responsible for the material in the Class Notes for the next class.

They will cover Class Notes 2 through 12.

Tips and Examples

Don't Use Screenshots in Piazza

Using chmod Twice to Change Permissions

Pipes and Redirection

Priting from Pipes


Computers are Fast But People are Slow

The Birth of Unix

Data Streams


Unix Devices Are Files

The Monitor and Keyboard

Standard Input, Standard Output and Standard Error

The Keyboard and Screen as Standard Input and Standard Output


Redirecting Standard Output

Redirecting Standard Input

Redirecting Standard Output Can Destroy a File

Adding Output to an Existing File


New Material

Running a Command in the Background


Moving a Job from the Foreground into the Background

Aborting a Background Job


Class Quiz