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Operating Systems and Using Linux

Topics

- Review Number Systems.
- Go over Homework 1 Solution.
- CSHC Hours of Operations.
- What is an Operating System?

The Number System

Position Number System

- The same digits have different meaning depending on their position in the numeral.
- The value of a digit depends on the digit itself of its position.
- Binary, decimal, hexadecimal are all position number system.

The Number System (con’t)

- Example: 4410
- 101 100
- 4 4
- ------------
- 4 x 10 + 4 = 4410

The Number System (con’t)

BinaryDecimalHexadecimalBinaryDecimalHexadecimal

0 0 0 1010 10 A

1 1 1 1011 11 B

10 2 2 1100 12 C

11 3 3 1101 13 D

100 4 4 1110 14 E

101 5 5 1111 15 F

110 6 6

111 7 7

1000 8 8

1001 9 9

Converting From Hexadecimal to Decimal

- Example: Convert 1A5F16 to decimal.
- 1A5F
- 163 162 161 160
- 4096 256 16 1
- Recall: A16 = 1010 and F16 = 1510.
- = 1 x 4096 + A x 256 + 5 x 16 + F x 1
- = 1 x 4096 + 10 x 256 + 5 x 16 + 15 x 1
- = 4096 + 2560 + 80 + 15
- = 675110

Converting From Decimal to Hexadeciaml

- Perform successive divisions by 16, placing the remainder (0-9, A-F) in each of the positions from right to left.
- Continue until the quotient is zero.
- Example: Convert 14310 to hex.
- 143 / 16 = 8 rem = 1510 = F16
- 8 / 16 = 0 rem = 8
- Done answer = 8F16
- To Check: 8 x 16 + 15 = 128 + 15 = 14310

Example of Equivalent Numbers

- Binary: 1 0 1 0 0 0 0 1 0 1 0 0 1 1 12
- Decimal: 2064710
- Hexadecimal: 50A716
- Notice that the number of digits needed is smaller as the base increases.

Homwork Solution 1

Go over homework solution 1!

Computer Science Help Desk

- CSHC (Computer Science Help Center) is staffed by student tutors.
- Help with homework and projects.
- Text editors and Linux questions.
- ECS 332A – Hours of Operations:
- Monday – Thursday 12 - 8 PM
- Friday 12 – 4 PM

What is an Operating System (OS)?

- A computer program
- Performs many operations, such as:
- Allows you to communicate with the computer (tell it what to do)
- Controls access (login) to the computer
- Keeps track of all processes currently running
- At this point, your main concern is how to communicate with the computer using the OS.

How Do I Communicate With the Computer Using the OS?

- You communicate using the particular OS’s
- user interface.
- Graphical User Interface (GUI) - Windows
- Command-driven interface - DOS, UNIX,
- Linux
- We will be using the Linux operating system,
- which is very similar to UNIX.

How Do I Communicate With the Computer Using the OS? (con’t)

- When you log in to the Linux system here, a user
- prompt will be displayed:
- linux#[1]% _
- where # is the number of the Linux server that you have connected to. You may use any of the Linux servers.
- The number in the brackets will change as you work. It is
- the “number” of the command that you are about to type.
- If this prompt is not on the screen at any time, you are not communicating with the OS.

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