version control - Undo 'git add' before commit - Stack Overflow

@Jonny, the index (aka staging area) contains all the files, not just changed files. It "starts life" (when you check out a commit or clone a repo) as a copy of all the files in the commit pointed to by HEAD. So if you remove a file from the index (git rm...

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oh ya~~ ...

這樣上課視野才好

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