Beginners Learn Linux No. 002 Notes Linux Brief introduction

Basic principles of Linux:

1, by the purpose of a single small program composition: The 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;

Interface between Linux and the user

GUI interface: Graphic User Interface

CLI interface: Command-Line Interface

Command prompt, prompt, bash (shell)

#: Root

$: Normal User

Interactive interface Classification and the interaction software used

Linux GUI:

GNOME:C Development

Kde:c++

Xface: Simple, lightweight desktop system for embedded platforms

Linux CLI:

Bash

Csh

Zsh

Ksh

Tcsh

Input command format: command option parameter

Options:

Short option:-character

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

Long option:--word

Parameters: The Action object of the command

Linux input is strictly case sensitive

Linux has multiple virtual terminals (terminal)

Default 6 switch mode Ctrl+alt+f1~f6 (note that notebook may not be used)

Startx & Start Graphical user interface Ctrl+alt+f7 can also switch the graphical interface (if you have to start the graphical interface beforehand)

Graphical interface start terminal Right >open terminal This terminal is analog terminal

Linux Simple Commands

Su:switch User Switch users

Su + user name (semi-toggle)

SU-L username (full switch)

Exit the user who exited the switch

passwd change the current user password (root user casual replacement password ordinary users need to comply with password complexity rules)

Password complexity rules:

1. Use at least 3 kinds of 4 types of characters;

2, long enough, more than 7 bits;

3, use random string;

4, regular replacement;

5, the cycle period is large enough;

The final summary of this tutorial contains the amount of knowledge

Rhce+rhca+shell Programming +mysql+web Cluster +hadoop+hbase+openstack

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Beginners Learn Linux No. 002 Notes Linux Brief introduction