第一步: 输入下面的命令

sudo xcodebuild -license
Password:

第二步: 同意Xcode条款

输入密码后要求你必须同意下面两个Xcode条款.

You have not agreed to the Xcode license agreements. You must agree to both license agreements below in order to use Xcode.

Hit the Enter key to view the license agreements at '/Applications/Xcode.app/Contents/Resources/English.lproj/License.rtf'

按照提示点击Enter键来查看条款.

Apple Inc.

Xcode and Apple SDKs Agreement

PLEASE SCROLL DOWN AND READ ALL OF THE FOLLOWING TERMS AND CONDITIONS CAREFULLY BEFORE USING THE APPLE SOFTWARE OR APPLE SERVICES.  THIS IS A LEGAL AGREEMENT BETWEEN YOU AND APPLE.  IF YOU AGREE TO BE BOUND BY ALL OF THE TERMS AND CONDITIONS, CLICK THE “AGREE” BUTTON.  BY CLICKING “AGREE” OR BY DOWNLOADING, USING OR COPYING ANY PART OF THIS APPLE SOFTWARE OR USING ANY PART OF THE APPLE SERVICES, YOU ARE AGREEING ON YOUR OW
... 巴拉巴拉一大堆...

By typing 'agree' you are agreeing to the terms of the software license agreements. Type 'print' to print them or anything else to cancel, [agree, print, cancel] 

点击空格看到最后，输入agree来同意条款.

agree

You can view the license agreements in Xcode's About Box, or at /Applications/Xcode.app/Contents/Resources/English.lproj/License.rtf

然后就可以正常使用git了.

bixiaopeng@bixiaopengtekiMacBook-Pro SecondApp$ git pull
Already up-to-date.