"Learning notes" Linux basics

Basic principles of Linux

1, consisting of a small program with a single purpose; a combination of small procedures to complete complex tasks;

2, everything is a document;

3, try to avoid capturing the user interface;

4, the configuration file is saved in plain text format;

GUI Interface:

CLI Interface:

Command prompt: Prompt,bash (shell)

#:root

$: Normal User

Command:

Command format:

Command option Parameters

Options:

Short Options:-

Multiple options can be combined:-a-b =-ab

Long options:--

Parameters: The Action object of the command (separated by a space between multiple parameters)

To use the voucher:

Linux systems are strictly case-sensitive

Virtual Terminal (terminal): Ctrl+alt+f1-f6

Gui:

Gnome:c

Ked:c++

XFace

Cli:

Sh

Bash

Csh

Zsh

Ksh

Tcsh

Su:switch User

# su [-l] User name

# passwd

Password complexity rules:

1, use 4 kinds of characters wrongly written characters in at least 3 kinds;

2, long enough, more than 7 bits;

3, use random string;

4, regular replacement;

5, the cycle period is large enough;

"Learning notes" Linux basics