Simulate the file system function in the Unix operating system. On the terminal interface, users can enter some commands like Unix shell commands, such as ls to display the file directory, chmod to change the file permission, chown to change the file owner, chgrp to change the file group, chnam to change the file name, pwd to display the current directory, cd to change the current directory, mkdir to create a directory, rmdir to delete a directory, mk to create a file, cp to copy a file, rm to delete a file, cat to display the file content, login to switch users, passwd to modify user passwords, etc. In the background, a mixed index file structure should be implemented, including using the free node number stack to manage free nodes and grouping links to manage free disk blocks.
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