經過git命令行從github上下載指定branch的項目源碼

不下載主線代碼，只下載支線代碼。git  輸入命令：git clone -b 分支名 git地址github 例如：主線是hydro-devel，咱們想下載indigo-devel版本，命令以下：it  git clone -b indigo-devel https://github.com/AaronMR/Learning_ROS_for_Robotics_Programming_2nd_edi

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