Summary of some common errors in git

git push error error: failed to push some refs to 'git@github.com:

$ git push -u origin master
To git@github.com:xxx/xxx.git
 ! [rejected]        master -> master (fetch first)error: failed to push some refs to 'git@github.com:xxx/xxx.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.

原因 github 远程仓库中readme.md文件不在本地仓库中 
   解决方法
$ git pull –rebase origin master
$ git push -u origin master 
   可以参考

Error message: fatal: remote origin already exists.

The reason for this error is remote origin already exists, the remote link already exists
The solution is to use git remote rm origin first, and then enter what you want to modify

When you can’t find the .ssh file in mac, you can use cat or vim command line to view it The content of the file to be viewed

Method to generate MAc ssh key locally

1. 查看秘钥是否存在

打开终端查看是否已经存在SSH密钥：cd ~/.ssh如果没有密钥则不会有此文件夹，有则备份删除,   也可以直接删除,  

2.生成新的秘钥, 命令如下

$ssh-keygen -t rsa -C "youremail@example.com"你需要把邮件地址换成你自己的邮件地址，然后一路回车，使用默认值即可，因为这个Key仅仅用于简单的服务，所以也无需设置密码。

完成后会有如下显示

Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /Users/你的电脑用户名/.ssh/id_rsa.
Your public key has been saved in /Users/你的电脑用户名/.ssh/id_rsa.pub.
The key fingerprint is:SHA256:5V6ZCQNS/3bVdl0GjGgQpWMFLazxTslnKbW2B1mbC+E example@qq.com如果服务器端需要公钥,  直接把.ssh目录下的id_rsa.pub配置即可, id_rsa为私钥一定要保密!!!!

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