UNIX & Linux University tutorial-Chapter 3 and Chapter 4 Study Notes

Before reading, please take 30 seconds to view the preface (in the first and second chapters)

UNIX & Linux University tutorial-
Chapter 1 and II study notes about UNIX & what is Linux? What is UNIX
UNIX & Linux University tutorial-Chapter 3 and Chapter 4 Study Notes UNIX connection & start using Unix
UNIX & Linux University tutorial-Chapter 5 and chapter 6 Study Notes Gui: graphical user interface & UNIX work environment
UNIX & Linux University tutorial-Chapter 7 and chapter 8 Study Notes UNIX keyboard use & programs available for immediate use
UNIX & Linux University tutorial-Chapter 9 and 10 learning notes documents: Unix manual and info & command syntax
UNIX & Linux University tutorial-Chapter 2 and Chapter 12 Study Notes shell & use shell: variables and options
UNIX & Linux University tutorial-Chapter 2 using shell: commands and customization
UNIX & Linux University tutorial-Chapter 5 and chapter 15 use shell to initialize the file
UNIX & Linux University tutorial-chapter 16th and chapter 17 Study Notes filter: Introduction and basic operations
UNIX & Linux University tutorial-Chapter 1 learning note filter: statistics and formatting
UNIX & Linux University tutorial-Chapter 1 (1) learning notes filter: selection, sorting, combination, and transformation
UNIX & Linux University tutorial-Chapter 2 (2) and Chapter 2 Learning note filter: selection, sorting, combination, and transformation of Regular Expressions
UNIX & Linux University tutorial-Chapter 2 Study Notes
UNIX & Linux University tutorial-Chapter 1 (1) Study Notes VI Text Editor (1)
UNIX & Linux University tutorial-Chapter 2 (2) Study Notes VI Text Editor (2)
UNIX & Linux University tutorial-Chapter 3 (3) Study Notes VI Text Editor (3)
UNIX & Linux University tutorial-Chapter 2 Study Notes Unix File System
UNIX & Linux University tutorial-Chapter 2 operations on the learning notes directory
UNIX & Linux University tutorial-Chapter 2 Study Notes File Operations
UNIX & Linux University tutorial-Chapter 1 (1) process and Job Control
UNIX & Linux University tutorial-Chapter 2 (2) Study Notes process and Job Control

Chapter 3: Unix connections

Basic

(Definition or description)

Interface (intreface ):When using a machine, you must have a way to interact with your computer. This function is called an interface.

Terminal ):The UNIX interface is called a terminal.

Host ):Except for the terminal

Computer = terminal + host

Terminal = input device + output device

Multi-channel programming:Old Name of multitasking

Time-sharing system:Old Name of a multi-user system

Terminal Server:A device acting as a vswitch is used to connect any terminal to any host.

Console ):Among all the terminals connected to the host, one is special and considered as part of the computer itself. It is used to manage the system.

Headless system:If the computer runs independently without human input, the computer does not need a terminal.

Most Web servers and email servers run Unix and are not connected to terminals.

Router (when a problem occurs, the Administrator opens the terminal connection route in his PC. Is there a terminal !!!! Only connection is required. I don't think there will be computers that never need a "head)

Server:Programs that provide certain types of services

Client:Use the server program

Character terminal (or text-based terminal ):A terminal that only uses text

Graphics terminal:It can process text and display any content that is drawn on the screen using small dots.

Chapter 4: Start Using Unix

Basic

First, the system administrator, user ID, password, account, login, enter the ID, and press return or enter.

(It can be seen that this book has many foundations ...... This is the 50th page content !)

UNIX case sensitive letters

ID and password:When you enter a non-existent identity, the system also asks for its password.

The first time after login is the last login time. Check the time.

Superuser:Use root to log on

Shell prompt:The bash and Korn shell prompts $ and C-shell prompts %. When using root to log on, the prompt is #

Command/Program

Whoami:Show current user ID

WHO:Show all current login user IDs

W:Display the login user and what the user is doing

Date:Show time and date

Logout/Exit:Cancel

Login:Prepare for login after cancellation(Some systems will temporarily change the user ID. After a new user logs out, the original session will be returned)

(I think it is better to forget this command)

CTRL + D:Send an EOF or "end-of-file" signal, shell termination, Unix logout(Most shells define a way to specify that you do not want to log out of the system by pressing CTRL + D)

Passwd:Change Password

Last:View the last or recent logon times. (+ User ID, only view this user information)

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