Linux Operating System Basics

1. Basic principles of Linux:

   A small program consisting of a single purpose, combined with a small program to complete complex tasks;

   all documents;

   Try to avoid capturing the user interface;

   The configuration file is saved in plain text format;

2. Interface

   GUI interface: Graphical user interface
   

CLT Interface: Command line interface

Command prompt, Prompt,bash (shell)

#:root Users

#: Normal User

Command command option Parameters

Options:

Short Options:-

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

Long options:--

Parameters: Command Action Object

Linux virtual terminal (terminal) Boot: ctrl+alt+ (F1-F6) ctrl+atl+f7 return to Linux GUI graphical interface: 0pen terminal open the analog terminal Linux GUI three kinds: Gnome, KDE , xfacelinux Common Command line Interface (CLI): SH bash csh zsh ksh tcshlinux Switch User: Su--swich user half switch: SU + username full switch: su [-l] + Usernamelinu x user Password Complexity principle: Use at least 3 of the category characters in 4, password long enough, greater than 7 bits, use random string, regular replacement, cycle period is large enough;

Linux Operating System Basics