1.linux, command

1. Understanding Linux

1, what is the operating system

2, real-life operating system

Win7

Mac

Android

Ios

3. History of operating system

Unix:

Minix:

Linux:

　　

1.2 Different versions of Linux and application areas

1. Introduction to the Linux kernel and release

<1> Linux kernel version

http://www.kernel.org

<2>linux Release version

　　　　

2. Application areas

Applications in the Personal Desktop area: Ubuntu, Fedora,

Server domain: Linux (Red Hat, Debian, SuSE), Unix

Embedded domain: Linux (set-top box, digital TV, mobile phone, smart home, etc.)

1.3 Files and directories

Linux Directory

User directory: For example (/home/user)

Relative path and absolute path

Absolute path

The path described from/directory starts with an absolute path

Cd/home

Ls/usr

Relative path

Cd.. /.. /(A. Current path, two: Current path upper path,.. /./）

LS ABC/SD

　　

File permissions

Access users

　

1.4 Linux Commands Overview

Ls

Pwd

Cd.. Absolute path (cd/bin), relative path (CD./path), TAB key to complete command

Ls-l list, ls-a Show hidden file, Ls-h,ls-alh, wildcard (LS *.py)

Touch 123.py Create a file

Clear Clear Screen

Command--help

Mans command

　　　　

　　　　

　　　　

3. Auto-Complete Tab

4. Historical command:

History View Historical Commands

　　

　　

　　

1.linux, command