From: www 
  Sent: Wednesday, February 20, 2013 9:32 PM
  Subject: [git-users] how to get the code changes of another person to my 
local code?


  I have used git for a while, but only for keeping tracking of the changes of 
my own in my own computer. I have never used git to cooperate with others. My 
naive question is: if somebody on the other city and me started with the same 
set files(or code), after a while, he has modified his files, how can I get all 
his changes to my files by using git?

  Thank you very much.
Usually you would agree to have a 'public' repository you can both access. It 
is normal that that repo is 'bare' - i.e. it doesn't actually have a working 
directory so neither of you could corrupt it. You would use separate branches 
for your own work. These are easy to create and use. 

You push your branches to the repo which then has the multi-branched composite 
of everybodies published work

You then pick up a copy of your collegues branches and make comparisons when 
you want to merge changes, or generate a personal branch on top of their work 
if you are extending it.

Git uses the sha1 hashes to verify and validate each bit of content, the file 
and directory structure, and the history linkages. So if you have the same sha1 
hash as someone else you have an exact copy of what they have. If the sha1 is 
different you have a personal variant. Git can trace back through the history 
links to find the common base commit at which you, or your collegue, branched 
off your development.

There are a number of good books and web sites. Such as
Git magic
Pro-git / git community book

The branching model is 
often refernced as well.


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