cd /source/directory 什么意思？

Question

Github上的 cd /source/directory 是什么意思？找不到source文件啊。比如这个，source 具体指的什么？

cd /source/directory
git clone --recursive https://github.com/costashatz/SpaceVecAlg.git
cd SpaceVecAlg
mkdir build && cd build
cmake -DCMAKE_BUILD_TYPE=Release -DENABLE_SIMD=ON -DPYTHON_BINDING=OFF ..
make -j
sudo make install

Answer 1

GitHub - costashatz/SpaceVecAlg: Implementation of spatial vector algebra with the Eigen3 linear algebra library. Implementation of spatial vector algebra with the Eigen3 linear algebra library. - GitHub - costashatz/SpaceVecAlg: Implementation of spatial vector algebra with the Eigen3 linear algebra library. https://github.com/costashatz/SpaceVecAlg#building
这里并没有cd操作，不是必要的

而且github上的readme提供了包管理器安装，应该比直接编译更简单一些

sudo add-apt-repository ppa:pierre-gergondet+ppa/multi-contact-unstable
sudo apt-get update
sudo apt-get install libspacevecalg-dev libspacevecalg-doc