Creating and implementing a shell just similar to cshell

This is the project assignment in my Operating Systems course in my masters program. This project is to produce an operational csh-like shell according to the instructions given by the [login to view URL] and the ish man page ([login to view URL]) included. Also included is the source for the parser (ish.l and ish.y files), parts of which may have to be edited. Basic idea is, when Make File is run from the user's home directory on Linux server, a prompt should display and ish shell should run which in turn takes commands and execute them. Detailed instructions are specified in the [login to view URL] and the ish man page ([login to view URL]) files.