What's the difference between `git add .` and `git add
I was assuming that both work in the same way. Both add every file onto index. But I seem wrong.
git add .  and git add -u ?  It is one of the git gotchas mentioned here (pre Git 2.0).
 git add . only adds what is there, not what has been deleted (if tracked).  
git add .
git commit
git status
//hey! why didn't it commit my deletes?, Oh yeah, silly me
git add -u .
git commit --amend
 git add -A would take care of both steps...  
 With Git 2.0, git add -A is default .  
 git add <path> is the same as " git add -A <path> " now, so that " git add dir/ " will notice paths you removed from the directory and record the removal.  
 In older versions of Git, " git add <path> " used to ignore removals.  
 You can say " git add --ignore-removal <path> " to add only added or modified paths in <path> , if you really want to.  
 Warning (git1.8.3 April 2013, for upcoming git2.0).  
 I have modified my answer to say git add -u .  , instead of git add -u .:  
 git add -u will operate on the entire tree in Git 2.0 for consistency with " git commit -a " and other commands.  
 Because there will be no mechanism to make " git add -u " behave as " git add -u . ", it is important for those who are used to " git add -u " (without pathspec) updating the index only for paths in the current subdirectory to start training their fingers to explicitly say " git add -u . " when they mean it before Git 2.0 comes.  
As I mentioned in "e"
 Like the manual says: git add .  will add all files in you current directory, while git add -u .  will only add those already being tracked.  
git add documentaiton
git add . 
add all files from the current directory
git add -u 
only update files currently being tracked.
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