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$ git log

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$ git log --pretty=oneline

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git log -n

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$ git init

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$ git add <file>
$ git commit -m "description"

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$ ssh-keygen -t rsa -C "[email protected]"

Generating public/private rsa key pair.  # 生成密钥对 
Enter file in which to save the key (/root/.ssh/id_rsa):  # 保存路径
Enter passphrase (empty for no passphrase):   # 密码，默认空
Enter same passphrase again:   # 重复密码
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
92:41:73:6d:ba:03:bf:36:f8:ab:a2:90:0c:9c:a1:85 [email protected]
The key's randomart image is:
+--[ RSA 2048]----+
|      o ..       |
| .   . o  o      |
|E..   .  o       |
|o.o   .o.        |
|oo    ooS.       |
|o.     .+        |
|o.     . o       |
| .  . . +        |
|  .. ..+oo       |
+-----------------+

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git remote add origin [email protected]:git_username/repository_name.git