Linux Operating System Basics

Basic principles of Linux systems:

1. consist of a small program with a single purpose; a combination of small procedures to complete complex tasks;

2. All documents;

3. Try to avoid capturing the user interface; (try not to interact with the user)

4. The configuration file is saved in plain text format.

Shell: human-computer interface

GUI interface: Graphical user interface interface

X-window

Gnome:c

Kde:c++

XFace

CLI Interface: Command line interface interface

Command prompt, Prompt,bash (shell)

#: admin, Root

$: Normal User

Ds.

Bash

Csh

Zsh

Ksh

Tcsh

Command format:

Command option Parameters

Options:

Short options:-A, multiple options can be combined, with spaces between multiple options

Long option:--word

Parameters: The Action object of the command

To use the voucher:

Virtual Terminal (Terminal): 6 virtual terminals, Ctrl+alt+f1-f6

Command: StartX & Enter Graphical interface

Linux Users: Root,student,visitor

Command Su:switch user--Switch users

#su-L User name--full switch

SU user name--half switch

#passwd--Change Password

Password complexity rules:

1. Use at least 3 of the 4 kinds of characters wrongly written characters;

2. Long enough, greater than 7 bits;

3. Use random strings;

4. Regular replacement;

5. The cycle period is large enough.

Linux Operating System Basics