This assignment description contains a sample data files for you to test your commands. You can assume your data file is called inventory.dat and it is located in the present working directory of the Unix commands. The data file presents a simple inventory system of crates and boxes. Crates cannot contain crates. Boxes cannot contain crates.
Boxes can contain stuff.
Crates cannot contain stuff that is not in a box. The definition of a box or crate will be written no more than once in the file. The names of boxes, crates, or stuff might contain a mix of upper and lower-case letters. For the box and crate names, the case does not matter . For the stuff, the case does matter.