Git add & Git add undo

• Init a repo

$ touch file01
$ touch file02
$ touch file03

$ git status
On branch master

No commits yet

Untracked files:
  (use "git add <file>..." to include in what will be committed)

        file01
        file02
        file03

nothing added to commit but untracked files present (use "git add" to track)

• Git add
  • Say I want to add file01, but accidentally add file01 and file02.

  $ git add file01 file02
  

  $ git status
  On branch master
  
  No commits yet
  
  Changes to be committed:
     (use "git rm --cached <file>..." to unstage)
  
        new file:   file01
        new file:   file02
  
  Untracked files:
    (use "git add <file>..." to include in what will be committed)
  
        file03
  

  git reset is required:

  git reset filename.txt
  Will remove a file named filename.txt from the current index, the "about to be committed" area, without changing anything else.

  git reset file02
  

  $ git status
  On branch master
  
  No commits yet
  
  Changes to be committed:
    (use "git rm --cached <file>..." to unstage)
  
        new file:   file01
  
  Untracked files:
    (use "git add <file>..." to include in what will be committed)
  
        file02
        file03
  

  • Say Say I don't want to add any file, but accidentally add all the files.

  $ git status
  On branch master
  
  No commits yet
  
  Untracked files:
    (use "git add <file>..." to include in what will be committed)
  
        file01
        file02
        file03
  
  nothing added to commit but untracked files present (use "git add"   
  to track)
  

   git add *
  

  $ git status
  On branch master
  
  No commits yet
  
  Changes to be committed:
    (use "git rm --cached <file>..." to unstage)
  
        new file:   file01
        new file:   file02
        new file:   file03
  

  $ git reset
  

  No dot(.) after reset

  $ git status
  On branch master
  
  No commits yet
  
  Untracked files:
    (use "git add <file>..." to include in what will be committed)
  
        file01
        file02
        file03
  
   nothing added to commit but untracked files present (use "git add"      
   to track)