Linux-basic concepts of file systems

Linux-basic concepts of file systems

In linux, all data is stored in a file and stored in a directory with a tree structure.

(1) file type

1. Common files

Including text files, source code files, and executable files. Linux does not distinguish between text and binary files.

2. Directory

Similar to the directory folder in windows.

3. Device Files

Character Device Files: Files starting with "c" can directly transmit data.

Block Device Files: Files starting with "B", read and write data blocks with memory buffer.

(2) viewing files

Command: ls-l

Drwxrwxr-x	2	Root	Root	4096	DEC 12 0910: 10	Reader
File Type	Number of Files	File owner	Group	File Size	Creation or modification time	File or directory name

File Type: file attributes + 3 file owner permissions + 3 group permissions + 3 others Permissions

R: readable

W: writable

X: executable

(3) file editing

Command for creating or editing a file: vi filename

Vi editor mode: Command mode, edit mode, and end mode (you can enter the ex command)

Tip: After opening the file, enter I to enter the editing mode, click ESC to exit the editing mode, enter q to exit the file, and enter wq to save and exit the file.

(4) file operation commands

Cp: copy an object

Mv: Rename or move a file

Rm: delete an object