Introduction - If you have any usage issues, please Google them yourself
(1) with a login (user login) (2) System initialization (construction paper roll, providing login module) (3) the creation of documents: create (4) Open the file: open (5) Reading file: read ( 6) to write the document: write (7) document the closure: close (8) delete the file: delete (9) create a directory (create a subdirectory): mkdir (10) to change the current directory: cd (11) are listed in files directory: dir (12) exit: logout