Write a custom shell program as described in the textbook: Programming Project 1, Part 1 (page 157). Do not do Part 2 (history feature) unless you wish to do so for fun. You are not required to detect & for background processes unless you wish to do so for fun. The minimum requirements are:

• Use the basic design provided in simple-shell.c that was provided in class and appears in Fig. 3.36.

• Parse the user input appropriately. You may use the approach provided in execvp_demo.c that was

  provided in class, or you may use a different approach that is more robust.

• Fork a new process for every command (except exit) in order to provide separate process control.

• Use wait() for the parent process.