-type f f : a regular file-type f ↑ file For example,find . -type f return:./Main.cpp./CMakeLists.txt./Settings/FocalLength.txt-type d d : directory For example,find . -type d return:../Settings./Utils./Data./build| This is called a pipe. It takes the output of the command on the left and passes it as input to the command on the right:command A | command B │ ↑ └───────..