Help with a programming assignment that requires the knowledge of Bash, fork, exec and C++

For this assignment, you are to design a simple shell which implements a subset of the functionality of the Bourne Again Shel (Bash). The requirements for your shell are as follows: . Continually prompt for textual user input on a command line . Parse user input according the provided grammar (see below) . When a user enters a well formed command, execute it in the same way as a shel. You must use the commands fork and exec to accomplish this. You may NOT use the C++ system command . Allow users to pipe the standard output from one command to the input of another an arbitrary number of times. Support input redirection from a file and output redirection to a file Allow users to specify whether the process will run in the background or foreground using an '&. Backgrounding processes should not result in the creation of zombie processes. (Commands to run in the foreground do not have an '&, and commands that run in the background do) . Allow your program to take an option"-t" which will run your shell the same way, just without a prompt