• Are there any UNIX tutorials I can read?
  

• Where do I find CampusWire for CS421?
  

• On a specific MP, can we use functions we defined in previous questions?
  
• Are we allowed to write helper functions?
  

Are there any UNIX tutorials I can read?

A few introductory tutorials for UNIX walkthrough are available from Washington University, the Unversity of Utah and from WebMonkey.

Where do I find CampusWire for CS 421?

CS 421 uses an external server CampusWire for discussion services. You should have received an email inviting you to join the CS 421 class feed. The URL for the feed is: https://campuswire.com/c/G262648A7/feed.

On a specific MP, can we use functions we defined in previous questions?

Unless we specify otherwise, the answer is yes. Compiled solutions to earlier questions that are relevant to a given question are generally given in a module named Plsolution.

Are we allowed to write helper functions?

As long as such helpers do not violate other requirements of the question (such as requiring the solution, overall, to be tail recursive), and as long as we don't specify otherwise; the answer is yes.