Access Control

A restaurant processes orders with a FIFO strategy. Orders are stored in file orders.txt$.$ Program

enqueue modifies orders.txt by adding an order to the tail of the queue. Program dequeue modifies

orders.txt by deleting the order at the head of the queue.

Define a UNIX$-$based ACL of the files so to ensure that the following access control policy is enforced by

the operating system:

willie and winona, the waiters, can add new orders, but cannot read nor delete existing orders;

charlie and cathy, the cooks, can read and delete existing orders, but cannot add new orders nor

carry out any other modification to orders. $tx$;

mario, the maitre, must be able to read the orders $($and possibly do other actions$).$

Please provide your answer by completing the dump of the $1s-1$ shell command $($assuming that all relevant

files are in the current folder$)$:

orders.txt

waiters enqueue

cooks dequeue

where cooks is a group containing charlie and cathy and waiters is a group containing willie and

winona.