From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marius Storm-Olsen <mstormo@gmail.com>
Subject: Re: untracked file deleted from the master branch, when checked out
 to it from a local branch
Date: Tue, 20 May 2014 11:56:57 -0500
Message-ID: <537B8959.7090100@gmail.com>
References: <2525467.KRXv8a3gWS@linux-wzza.site>
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To: Arup Rakshit <aruprakshit@rocketmail.com>, git@vger.kernel.org
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On 5/20/2014 10:38 AM, Arup Rakshit wrote:
> I was following some tutorial (http://gitref.org/branching/#merge) - and doing
> it in my console :
>
> Arup-iMac:arup_git shreyas$ git status
> # On branch master
> nothing to commit, working directory clean
> Arup-iMac:arup_git shreyas$ touch test.rb
> Arup-iMac:arup_git shreyas$ ls
> git_1.txttest.rb
> Arup-iMac:arup_git shreyas$ cat test.rb
> Arup-iMac:arup_git shreyas$ vi test.rb
> Arup-iMac:arup_git shreyas$ cat test.rb
> class Foo
>    def self.bar
>      12
>    end
> end
>
> Foo.bar
> ***********HERE I switched to a NEW Branch****************
...
> ********FROM MASTER BRACH WHY THE FILE test.rb DELETED?***********
> Arup-iMac:arup_git shreyas$ ls
> git_1.txt

Because you never committed the original file to the master branch 
before you created and switched to the change_class branch.

You're missing
     git add test.rb
     git commit -m "initial version of test.rb"
before you switch branches the first time.

-- 
.marius