[求助]谁来帮我看看这题目啊，好难啊，哪位大哥能帮一下小弟吗？

Question

Unix shells provide operators like |, &&, ||, ; and exit status to combine commands. The operators can be used to control the commands when running under the same shell.

In this project you will develop a shell like the idea to multiple computers sharing a common file system. We wish to allow a user to specify the computer on which each (component) command runs. We will also allow use of parentheses to specify more sophisticated arrangements.

For example command:
[alpha] gcc prog.c && [beta] ./a.out

Would compile program on computer alpha.comp.mel.edu.au and then run the compiled program on computer beta.comp.mel.edu.au. Final output would appear on the original computer where the user is logged in. However, using the standard meaning of command combiner &&, the compiled program will run only if the compilation succeeded.

The assignment assumes that the user is appropriately logged into the participating computers. Each team can make assumptions to suit their design needs.

Marks are distributed as follows:
Nine marks for being able to run command components on the named computers.
Five marks for being able to receive exit status on primary computer.
Six marks for successful implementation of combiners &&, ||, and ;.
Nine marks for successful implementation of pipe (|) combiner communicating data across computers.