git可以先创建本地的Repo，然后push到远程Repo上，也可以直接先从一个远程的Repo通过git clone创建一个本地Repo，然后拉取（fetch或pull）远程Repo到本地或将本地的修改(push)推动到远程Repo中。并且可以用git remote add添加多个远程Repo并在本地给它们起一个短的名字。
git clone 命令可将一个远程repo 克隆（clone）到本地文件夹并创建一个本地的repository，在本地的ticgit仓库中，为远程的repo创建一个默认名origin的关联。 今后可以通过名字origin对它对应的远程Repo进行操作，如用push将修改推动到远程Repo或pull(fetch)将这个远程Repo的内容拉到本地来。
将修改push到远程repo或将远程repo内容拉到(pull)本地。
$ git clone https://github.com/schacon/ticgit
Cloning into 'ticgit'...
remote: Reusing existing pack: 1857, done.
remote: Total 1857 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (1857/1857), 374.35 KiB | 268.00 KiB/s, done.
Resolving deltas: 100% (772/772), done.
Checking connectivity... done.
用git remote命令查看本地repo有多少个短名（如origin）关联了远程的Repo，可以通过短名字去读（fetch/push）写远程的repo.
$ cd ticgit
$ git remote
origin
可以通过选项参数”-v”显示本地git的远程repo的关联短名对应的远程Repo的URL地址，
$ git remote -v
origin https://github.com/schacon/ticgit (fetch)
origin https://github.com/schacon/ticgit (push)
git remote add可以添加其他远程Repo并为这些远程repo指定本地的短名字。如下面命令先查询当前有多少个远程的repo，然后添加一个新的名为pb的远程Repo：
$ git remote
origin
$ git remote add pb https://github.com/paulboone/ticgit
$ git remote -v
origin https://github.com/schacon/ticgit (fetch)
origin https://github.com/schacon/ticgit (push)
pb https://github.com/paulboone/ticgit (fetch)
pb https://github.com/paulboone/ticgit (push)
你可以通过fetch命令将pb的远程Repo内容拉取到本地来：
$ git fetch pb
remote: Counting objects: 43, done.
remote: Compressing objects: 100% (36/36), done.
remote: Total 43 (delta 10), reused 31 (delta 5)
Unpacking objects: 100% (43/43), done.
From https://github.com/paulboone/ticgit
* [new branch] master -> pb/master
* [new branch] ticgit -> pb/ticgit
这个fetch命令获取了pb名关联的远程存储的2个分支pb/master和pb/ticgit。
用push命令可将本地修改的内容push到远程Repo上，如：
$ git push origin master
将本地短名origin的修改内容push到它对应的那个远程Repo（即https://github.com/schacon/ticgit）的master分支上。
git remote show可以查询一个短名关联的远程Repo的更多信息：
$ git push origin master
* remote origin
URL: https://github.com/my-org/complex-project
Fetch URL: https://github.com/my-org/complex-project
Push URL: https://github.com/my-org/complex-project
HEAD branch: master
Remote branches:
master tracked
dev-branch tracked
markdown-strip tracked
issue-43 new (next fetch will store in remotes/origin)
issue-45 new (next fetch will store in remotes/origin)
refs/remotes/origin/issue-11 stale (use 'git remote prune' to remove)
Local branches configured for 'git pull':
dev-branch merges with remote dev-branch
master merges with remote master
Local refs configured for 'git push':
dev-branch pushes to dev-branch (up to date)
markdown-strip pushes to markdown-strip (up to date)
master pushes to master (up to date)
更详细说明参考： Git Basics - Working with Remotes
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