Git提交数据失败 error: failed to push some refs to 'https://github.com/XXXXXXX/gif.git'

附载码云的使用教程地址：http://www.jianshu.com/p/084e0aabbab3

问题一：执行Git remote add origin https://github.com/XXXXXXX/gif.git

                fatal: remote origin already exists.

               出现此问题时，git remote显示所有的远程库，使用命令git remote rm origin删除该origin。

问题二： git push -u origin master推送本地库到github
                 fatal: I don't handle protocol 'git@https'

                出现此问题时，使用命令git remote add origin http://github.com/XXXXXXX/gif.git 。

问题三：执行$ git push -u origin master
                 Username for 'https://github.com/XXXXXXX/gif.git'
                                     ! [rejected]        master -> master (fetch first)
                                    error: failed to push some refs to 'https://github.com/XXXXXXX/gif.git'
                                    hint: Updates were rejected because the remote contains work that you do
                                    hint: not have locally. This is usually caused by another repository pushing
                                    hint: to the same ref. You may want to first integrate the remote changes
                                    hint: (e.g., 'git pull ...') before pushing again.
                                    hint: See the 'Note about fast-forwards' in 'git push --help' for details.

                  错误的主要原因是git仓库上已经存在readme文件，故在提交时可能会存在冲突，这时您需要选择的是保留线上的文件或者舍弃线上的文件，如果您舍弃线上的           文 件，则在推送时选择强制推送，强制推送需要执行下面的命令

git push origin master -f

如果您选择保留线上的readme文件,则需要先执行

git pull origin master

Git使用步骤：

在GitHub上新建一个abc仓库。

在本地新建Git仓库：

1、mkdir abc

2、cd abc

3、git init

4、将文件添加进去(file)

5、git add file1 file2 file...

6、git commit -m "add files"

7、git remote add origin https://git.oschina.net/xxx/abc.git

8、git push -u origin master

在这里，出现了错误提示：

error: failed to push some refs to 'https://git.oschina.net/xxx/abc.git'

hint: Updates were rejected because the tip of your current branch is behind

hint: its remote counterpart. Merge the remote changes (e.g. 'git pull')

hint: before pushing again.

hint: See the 'Note about fast-forwards' in 'git push --help' for details.

这里提示推送失败，因为在GitHub上初始化了一个README.MD文件，远程仓库中的文件比本地的要新，所以要使用git pull要把最新的文件抓下来，与本地的文件合并之后在提交。

9、git pull

提示错误：

remote: Counting objects: 5, done.

remote: Compressing objects: 100% (2/2), done.

remote: Total 3 (delta 0), reused 3 (delta 0)

Unpacking objects: 100% (3/3), done.

From github.com:michaelliao/learngit

fc38031..291bea8  dev        -> origin/master

There is no tracking information for the current branch.

Please specify which branch you want to merge with.

See git-pull(1) for details

git pull <remote> <branch>

原因是没有指定本地master和远程origin/master的连接。

10、设置连接

$ git branch --set-upstream master origin/master

11、git pull

12、然后提交

git commit -m "merge README.MD"

13、git push -u origin master

完成本地上传远程仓库