Enhance the file system simulator to include a new method, Kernel.chown(), which, given the name of a file, a uid, and a gid, sets the file's uid and gid to the values given. Note that only the owner of a file (or the super-user) may change the gid of a file. Only the super-user may change the uid of a file. To test your new method, write two new programs chown.java and chgrp.java which accept a uid or gid (respectively) and a list of file or directory names.
Enhance the file system simulator to include a new method, Kernel.chmod(), which, given the name of a file and a mode, sets the file's mode to the value given. Note that only the owner of a file (or the super-user) may change the mode for a file, and that only the 9 low-order bits of mode are affected. To test your new method, write a new program chmod.java which accepts a mode value (000..777) and a list of file or directory names.
Enhance the file system simulator to include a new method, Kernel.link(), which, given two path names, creates the second path as a (hard) link to the first path. link() should find the inode number for the first file, and then write a directory entry for the second path which references the same index node. Don't forget to increment nlink on the index node. To test your new method, write a new program, ln.java, which, given two path names, performs the link() operation. Assume that creating a link to a directory is not allowed.