Day01-1 Common DOS commands

Computer = hardware + software

Hardware:

Cpu	Computing core and control core in the computer. Responsible for understanding the computer's instructions and the execution of computer operations.

Memory	A bridge between data and CPU interaction. The data required by the program will be loaded into memory first. The CPU directly reads the data in memory for operation.	Features: fast access speed.	Cons: When a power outage or program exits, the data in memory is lost.
HDD (Mechanical hard drive, SSD):	The data can be saved permanently	Disadvantage: Slow access speed	Solid-state drives: very fast reading speed

Software: A collection of computer instructions and data organized in a certain order.

Software = data + instructions

Categories of software:

System software:	Windows,linux,mac Os,ios,andorid
Application software: (Must be based on the system software to use)	QQ, Thunder

The nature of software (what the software solves for us): improves the efficiency of human interaction with computers.

How humans interact with computers:

1. Graphical interface: simple, powerful

2. Through DOS commands

Common DOS commands:

Drive letter:

Enter under the specified disk such as: D:

Folder operations:

Dir	Show files and folders for the current directory
CD path	Enter the specified path
Cd..	Will retire the parent directory
CD \	The root directory in the current directory will be retired
MD + folder name	Create a folder
Rd + folder name	Delete an empty folder Note: cannot be used to delete a non-empty folder

File operation:

echo Data > file name	Create a file and specify the data to write
Type file name	View the specified file contents
del file name	Delete the specified file note: Del followed by a folder, then delete all the files in the folder
*	wildcard character (can match any file name)
tab	Content completion
Cls	Clear Screen
Up and DOWN ARROW keys	Get back the last command you wrote.
Exit	Close the console

Day01-1 Common DOS commands