can you please explian the step how to do it i want learn

Write a simple single thread CSC4420 shell , i.e., no concurrent commands, to support at least the following built-in commands:

prompt can set to any string you input, in addition to the current history event number, i.e, %h as in csh;

hour : list class times

room : list classroom location

desp : list the description of this course

text : list the textbook

ref : list the reference books

prof : list the professor's name

pol : professor's office location

poh : professor's office hours

pma : professor's email address

pre : list the course pre-requisites

cor : list the course co-requisite

hw : list the number of home works

gr : list the grading policy (what percentage for home works, midterm exam, and final exam)

history : list history of events up to the number you set

help : list all the available commands

exit or quit : exit CSC4420 shell