The linux command line--part Two Configuration And The Environment

Part 2 - Configuration And The Environment

 11 - The Environment

    printenv - Print part or all of the environment

    set - Set shell options

    export - Export environment to subsequently executed programs

    alias - Create an alias for a command

 What is stored in the environment?

   envirnoment variables and shell variables

 Examining The Environment

 What's In A Startup File?

 Modifying The Environment

 Which Files Should We Modify?

Text Editors

Using A Text Editor

12. A Gentle Introduction To vi

   vi

   :q

   :q!

  Entering Insert Mode

   "i" key

  Saving Our Work

  :w

Moving The Cursor Around

  Cursor Movement Keys



Basic Editing

  insert mode

  command mode

Opening A Line

  


Deleting Text

 Text Deletion Commands



Cutting, Copying, And Pasting Text

Yanking Commands



Joining Lines

 J command

Search-And-Replace

 Searching Within A Line

   f command

   eg. fa

 Searching The Entire File

  / command

  eg. /Log  n command  get the next

 Global Search-And-Replace

  :%s/pattern/replace/g

  


  


 Editing Multiple Files

   vi files1 file2 file3...

 Switching Between Files

   :n    To switch from one file to the next

   :N   To move back to the previous file use

   :buffers

   :buffer 2

 Opening Additional Files For Editing

  vi foo.txt

  :e foo2.txt

 Copying Content From One File Into Another

   yy （copy）

   p （paste）

 Inserting An Entire File Into Another

 ：r

 Saving Our Work

  ：w

   :wq

   :w filename     This act like "Save As....."

 13 – Customizing The Prompt

   Anatomy Of A Prompt

     echo $PS1

    PS1='[\u@\h \W]\$'  的意思就是：[当前用户的账号名称@主机名的第一个名字 工作目录的最后一层目录名]

 


  Trying Some Alternative Prompt Designs

  Adding Color

 


 


 


Moving The Cursor

 


Saving The Prompt