cd <directory>
Short for "change directory".
The shorthand name for the current directory is .
The shorthand name for the parent directory is ..
pwd
present working directory
ls
list the contents of the present directory
makedir <directory> //<directory> is the represent for the name of the directory
Short for "make directory",this command will create a new subdirectory called <directory> located in the current directory
原文：https://www.cnblogs.com/jllin/p/9919855.html