Basic concepts of Linux Learning

1.Linux Features:

1. Open source

2. Free

3. Stability

2.shell: Command line interpreter to identify and analyze commands. Shell Development Shell (interface Program) and Windows window functions the same.

Shell Shell Features:

1. Read and Identify commands

2. Adjust the interface provided by the operating system

3. Interface return command

BASH interpreter: a shell

3. Von Neumann thought, the computer divides into: the input device, the memory, the calculator, the controller, the output.

4. Memory: Memory-cache (caches)-register

Persistent storage media: power-down still in

Loss-of-power volatile storage media: memory, Cache, register

5. In Linux, Files: devices, displays, all document design ideas (software layer implementation of virtual)

File type: Normal file (-), directory file (content and other files different, d), link file (l), device file (character: printer, keyboard; block: Disk), pipe, socket (socket), where pipelines and sockets are two mechanisms of process communication.

Files starting with. are hidden files (relative).

File attributes (properties and Types):

Read

Write

Perform

6. Access to the directory is independent of the Read permission and is related to execution permissions.

Directory Permissions: Execute permissions (CD), read folder contents, write (newly created folder contents)

7.CPU function: Take instruction, read instruction (analysis is logical instruction or operation instruction), execute instruction.

8. If there is a task, the shell does not execute itself, the child process is created to complete the task, the parent process focuses on the command line, and the child process tells the parent process whether the execution was successful.

9. Operating system (Kernel): Management of computer resources, major device management, file management, storage management, process management.

10.Linux memory space: From low address to high address are: code snippet, initialized variable area, global variable and static variable area, for initializing variable area, heap, shared map area, stack, command line parameter, environment variable.

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Basic concepts of Linux Learning